diff --git a/src/kiri/app/conf/defaults.js b/src/kiri/app/conf/defaults.js
index a829966e..6ce92a9e 100644
--- a/src/kiri/app/conf/defaults.js
+++ b/src/kiri/app/conf/defaults.js
@@ -518,6 +518,7 @@ export const conf = {
                 camLatheAngle: 1,
                 camLatheLinear: true,
                 camLatheOver: 0.1,
+                camLatheDown: 0,
                 camLatheSpeed: 500,
                 camLatheSpindle: 1000,
                 camLatheTool: 1000,
diff --git a/src/kiri/app/conf/manager.js b/src/kiri/app/conf/manager.js
index a5cbe5cc..81fb7339 100644
--- a/src/kiri/app/conf/manager.js
+++ b/src/kiri/app/conf/manager.js
@@ -7,6 +7,7 @@ import { codec } from '../../core/codec.js';
 import { consts } from '../../core/consts.js';
 import { space } from '../../../moto/space.js';
 import { local } from '../../../data/local.js';
+import { newWidget } from '../widget.js';
 import { utils } from '../../core/utils.js';
 import { version } from '../../../moto/license.js';
 import { JSZip } from '../../../ext/jszip-esm.js';
@@ -608,6 +609,7 @@ function settingsImport(data, ask) {
                         work.type = 100;
                     }
                 }
+                codec.setFactory(codec.TYPE.WIDGET, newWidget);
                 codec.decode(data.work).forEach(widget => {
                     api.platform.add(widget, 0, true, true);
                 });
diff --git a/src/kiri/core/codec.js b/src/kiri/core/codec.js
index 7f6de9ea..ee102444 100644
--- a/src/kiri/core/codec.js
+++ b/src/kiri/core/codec.js
@@ -7,6 +7,7 @@ import { Slice, newSlice, Top, newTop } from './slice.js';
 import { Widget, newWidget } from './widget.js';
 
 const decoders = {};
+const factories = {};
 const freeMem = true;
 
 const TYPE = {
@@ -213,6 +214,11 @@ function decodePointArray2D(array, z, fn) {
     return points;
 }
 
+function setFactory(type, factory) {
+    factories[type] = factory;
+    return codec;
+}
+
 // ----- Widget Codec -----
 
 Widget.prototype.encode = function(state) {
@@ -236,7 +242,8 @@ registerDecoder(TYPE.WIDGET, function(v, state) {
     const id = v.id,
         group = v.group || id,
         track = v.track || undefined,
-        widget = newWidget(id, Widget.Groups.forid(group)),
+        factory = factories[TYPE.WIDGET] ?? newWidget,
+        widget = factory(id, Widget.Groups.forid(group)),
         meta= v.meta || widget.meta,
         anno = v.anno || widget.anno;
 
@@ -480,6 +487,7 @@ registerDecoder(TYPE.LAYERS, function(v, state) {
 });
 
 export const codec = {
+    TYPE,
     encode,
     decode,
     registerDecoder,
@@ -488,10 +496,12 @@ export const codec = {
     decodePointArray,
     encodePointArray2D,
     decodePointArray2D,
+    setFactory,
     toCodable
 };
 
 export {
+    TYPE,
     encode,
     decode,
     registerDecoder,
@@ -500,6 +510,7 @@ export {
     decodePointArray,
     encodePointArray2D,
     decodePointArray2D,
+    setFactory,
     toCodable
 };
 
diff --git a/src/kiri/core/widget.js b/src/kiri/core/widget.js
index 20874102..78591324 100644
--- a/src/kiri/core/widget.js
+++ b/src/kiri/core/widget.js
@@ -181,9 +181,13 @@ class Widget {
         return this.loadVertices(...arguments);
     }
 
-    setModified() {
+    setModified(reason) {
         this.modified = true;
         this.boundingBoxNeedsUpdate = true;
+        this.clearShadows();
+        if (reason !== 'axis') {
+            this.cache.geo = undefined;
+        }
         if (this.mesh && this.mesh.geometry) {
             // this fixes ray intersections after the mesh is modified
             this.mesh.geometry.boundingSphere = null;
@@ -355,7 +359,7 @@ class Widget {
         // invalidate cached points
         if (x || y || z) {
             this.points = null;
-            this.setModified();
+            this.setModified('moveMesh');
         }
     }
 
@@ -372,11 +376,11 @@ class Widget {
     }
 
     setAxisIndex(deg) {
+        // console.trace(deg);
         let rad = deg * (Math.PI / 180);
         if (rad !== this.track.indexRad) {
             this.track.indexRad = rad;
-            this.clearShadows();
-            this.setModified();
+            this.setModified('axis');
             this._updateMeshPosition();
         }
     }
@@ -429,7 +433,7 @@ class Widget {
             pos.z += (z || 0);
         }
         if (x || y || z) {
-            this.setModified();
+            this.setModified('_move');
             this._updateMeshPosition();
         }
     }
@@ -475,7 +479,7 @@ class Widget {
         scale.x *= (x || 1.0);
         scale.y *= (y || 1.0);
         scale.z *= (z || 1.0);
-        this.setModified();
+        this.setModified('_scale');
     }
 
     rotate(x, y, z, temp, center = true) {
@@ -514,7 +518,7 @@ class Widget {
             rot.y += (y || 0);
             rot.z += (z || 0);
         }
-        this.setModified();
+        this.setModified('_rotate');
     }
 
     // undo all accumulated rotations
@@ -524,7 +528,7 @@ class Widget {
         });
         this.roto = [];
         this.center();
-        this.setModified();
+        this.setModified('unrotate');
         if (this.refreshVisualState) this.refreshVisualState();
     }
 
@@ -563,7 +567,7 @@ class Widget {
         }
         pos.needsUpdate = true;
         ot.mirror = !ot.mirror;
-        this.setModified();
+        this.setModified('_mirror');
         this.points = null;
     }
 
@@ -586,6 +590,17 @@ class Widget {
 
     getGeoVertices(opt = {}) {
         const { unroll, translate } = opt;
+        let cacheKey = [
+            unroll ? 1 : 0,
+            translate ? 1 : 0,
+            ((this.track.indexRad ?? 0) * 100000) | 0
+        ].join(',');
+        let marked = Date.now();
+        let geoCache = this.cache.geo = (this.cache.geo || {});
+        let cached = geoCache[cacheKey];
+        if (cached) {
+            return cached.pos;
+        }
         let geo = this.mesh.geometry;
         let pos = geo.getAttribute('position');
         // if indexed, return points rotated about X and then offset
@@ -595,6 +610,7 @@ class Widget {
                 .applyMatrix4( new THREE.Matrix4().makeRotationX(-track.indexRad) );
         }
         pos = pos.array;
+        // unroll indexed geometry
         if (geo.index && unroll !== false) {
             let idx = geo.index.array;
             let len = idx.length;
@@ -608,12 +624,8 @@ class Widget {
                 pp2[inc++] = pos[ip];
             }
             pos = pp2;
-        } else if (translate) {
-            pos = pos.slice();
         }
-        // used by CAM.shadowAt()
-        this.cache.geo = pos;
-        delete this.cache.shadow;
+        geoCache[cacheKey] = { pos, marked };
         return pos;
     }
 
@@ -631,7 +643,7 @@ class Widget {
         if (!this.bounds || refresh || this.boundingBoxNeedsUpdate) {
             this.bounds = new THREE.Box3().setFromArray(this.getGeoVertices({
                 translate: true,
-                unroll: false
+                unroll: true
             }));
             this.boundingBoxNeedsUpdate = false;
         }
@@ -701,6 +713,7 @@ class Widget {
         // find closest shadow above and use to speed up delta shadow gen
         let zover = Object.keys(shadows).map(v => parseFloat(v)).filter(v => v > z);
         let minZabove = Math.min(Infinity, ...zover);
+        // shift shadow probeline down a fraction to capture z flats with FP noise
         let shadow = this.#computeShadowAt(z - 0.005, minZabove);
         if (minZabove < Infinity) {
             shadow = POLY.union([...shadow, ...shadows[minZabove]], 0, true, { wasm: false });
@@ -725,7 +738,7 @@ class Widget {
         if (this.cache.shadow) {
             return;
         }
-        const geo = this.cache.geo;
+        const geo = this.getGeoVertices({ unroll: true, translate: true });
         const length = geo.length;
         const bounds = this.getBoundingBox();
         const stack = {};
diff --git a/src/kiri/mode/cam/cl-ops.js b/src/kiri/mode/cam/cl-ops.js
index fc03e33f..fb1ae0a6 100644
--- a/src/kiri/mode/cam/cl-ops.js
+++ b/src/kiri/mode/cam/cl-ops.js
@@ -350,8 +350,9 @@ export function createPopOps() {
     createPopOp('lathe', {
         tool: 'camLatheTool',
         spindle: 'camLatheSpindle',
-        step: 'camLatheOver',
         angle: 'camLatheAngle',
+        step: 'camLatheOver',
+        down: 'camLatheDown',
         rate: 'camLatheSpeed',
         tolerance: 'camTolerance',
         filter: 'camContourFilter',
@@ -365,8 +366,9 @@ export function createPopOps() {
         spindle: UC.newInput(LANG.cc_spnd_s, { title: LANG.cc_spnd_l, convert: toInt, show: hasSpindle }),
         rate: UC.newInput(LANG.cc_feed_s, { title: LANG.cc_feed_l, convert: toInt, units }),
         sep: UC.newBlank({ class: "pop-sep" }),
-        step: UC.newInput(LANG.cc_sovr_s, { title: LANG.cc_sovr_l, convert: toFloat, bound: UC.bound(0.01, 100.0) }),
         angle: UC.newInput(LANG.cc_sang_s, { title: LANG.cc_sang_l, convert: toFloat, bound: UC.bound(0.01, 180.0) }),
+        step: UC.newInput(LANG.cc_sovr_s, { title: LANG.cc_sovr_l, convert: toFloat, bound: UC.bound(0.01, 100.0) }),
+        // down: UC.newInput(LANG.cc_sdwn_s, { title: LANG.cc_sdwn_l, convert: toFloat, units }),
         sep: UC.newBlank({ class: "pop-sep" }),
         offStart: UC.newInput(LANG.ci_laso_s, { title: LANG.ci_laso_l, convert: toFloat}),
         offEnd: UC.newInput(LANG.ci_laeo_s, { title: LANG.ci_laeo_l, convert: toFloat}),
diff --git a/src/kiri/mode/cam/driver-be.js b/src/kiri/mode/cam/driver-be.js
index d4d6b39c..2212908e 100644
--- a/src/kiri/mode/cam/driver-be.js
+++ b/src/kiri/mode/cam/driver-be.js
@@ -18,9 +18,9 @@ function surface_prep(widget, index) {
     }
 };
 
-function surface_find(widget, faces, radians) {
+function surface_find(widget, faces, radians, filterZ) {
     surface_prep(widget);
-    return widget.tool.findConnectedSurface(faces, radians || 0, 0.0);
+    return widget.tool.findConnectedSurface(faces, radians, filterZ);
 };
 
 function init(worker) {
diff --git a/src/kiri/mode/cam/init-menu.js b/src/kiri/mode/cam/init-menu.js
index 5b660b2e..d061b1c0 100644
--- a/src/kiri/mode/cam/init-menu.js
+++ b/src/kiri/mode/cam/init-menu.js
@@ -114,6 +114,10 @@ export function menu() {
     camStockOffset:      newBoolean(LANG.cs_offs_s, onBooleanClick, {title:LANG.cs_offs_l}),
     camStockIndexed:     newBoolean(LANG.cs_indx_s, onBooleanClick, {title:LANG.cs_indx_l}),
     camStockIndexGrid:   newBoolean(LANG.cs_ishg_s, onBooleanClick, {title:LANG.cs_ishg_l, show:() => ui.camStockIndexed.checked}),
+    // separator:           newBlank({ class:"set-sep", driven }),
+    // camStockManual: newRow([
+    //     (ui.stockPlace = newButton('position', onButtonClick, { })),
+    // ], {class:"ext-buttons f-row"}),
     _____:               newGroup(LANG.cc_menu, $('cam-limits'), { modes:CAM, driven, separator }),
     camZAnchor:          newSelect(LANG.ou_zanc_s, {title: LANG.ou_zanc_l, action:zAnchorSave, show:() => !ui.camStockIndexed.checked}, "zanchor"),
     camZOffset:          newInput(LANG.ou_ztof_s, {title:LANG.ou_ztof_l, convert:toFloat, units}),
diff --git a/src/kiri/mode/cam/init-ui.js b/src/kiri/mode/cam/init-ui.js
index 706cb456..81a2ed94 100644
--- a/src/kiri/mode/cam/init-ui.js
+++ b/src/kiri/mode/cam/init-ui.js
@@ -792,8 +792,24 @@ export function init() {
 
     // TAB/TRACE BUTTON HANDLERS
     api.event.on("button.click", target => {
-        let process = api.conf.get().process;
+        let { process, stock } = api.conf.get();
         switch (target) {
+            case api.ui.stockPlace:
+                api.uc.prompt("stock x,y,z position", "").then(csv => {
+                    if (csv) {
+                        let [x,y,z] = csv.split(',').map(v => parseInt(v) || 0);
+                        let center = {
+                            x: x ?? 0,
+                            y: y ?? 0,
+                            z: z ?? 0
+                        }
+                        // move widgets based on postion
+                        // more complex than just moving stock
+                        // because stock is based on contents, not the other way
+                        console.log({ x,y,z });
+                    }
+                });
+                return;
             case api.ui.tabAdd:
                 return tabAdd();
             case api.ui.tabDun:
diff --git a/src/kiri/mode/cam/slice.js b/src/kiri/mode/cam/slice.js
index 70597045..4c260399 100644
--- a/src/kiri/mode/cam/slice.js
+++ b/src/kiri/mode/cam/slice.js
@@ -241,7 +241,6 @@ export async function cam_slice(settings, widget, onupdate, ondone) {
     }
 
     async function computeShadows() {
-        // console.log('(re)compute shadows');
         await new OPS.shadow(state, { type: "shadow", silent: true }).slice(progress => {
             // console.log('reshadowing', progress.round(3));
         });