diff --git a/public/test/5137.glb b/public/test/5137.glb
index e0c7a3ab2..f2622dfed 100644
Binary files a/public/test/5137.glb and b/public/test/5137.glb differ
diff --git a/scripts/buildAssets.ts b/scripts/buildAssets.ts
index 53e02e967..e7e27426b 100644
--- a/scripts/buildAssets.ts
+++ b/scripts/buildAssets.ts
@@ -595,12 +595,12 @@ if (allTargets || targets?.includes('tankModels')) {
         // if (id !== 24609) continue; // concept 1b
         // if (id !== 16401) continue; // waffle
         // if (id !== 7425) continue; // isu 152
-        if (id !== 10369) continue; // mino
+        // if (id !== 10369) continue; // mino
         // if (id !== 4417) continue; // amx m4 mle
         // if (id !== 7297) continue; // 60tp
         // if (id !== 1) continue; // t-34
         // if (id !== 6753) continue; // type 71
-        // if (id !== 5137) continue; // tiger ii
+        if (id !== 5137) continue; // tiger ii
         // if (id !== 11633) continue; // forest witch
         // if (id !== 6225) continue; // fv215b
 
diff --git a/src/core/blitz/extractModel.ts b/src/core/blitz/extractModel.ts
index 3e66d901b..fb8292873 100644
--- a/src/core/blitz/extractModel.ts
+++ b/src/core/blitz/extractModel.ts
@@ -1,5 +1,4 @@
 import { Document, Material, Node, Scene } from '@gltf-transform/core';
-import { writeFile } from 'fs/promises';
 import { range, times } from 'lodash';
 import { dirname } from 'path';
 import {
@@ -15,10 +14,6 @@ import { ScgStream, vertexAttributeVectorSizes } from '../streams/scg';
 import { VertexAttribute } from '../streams/scpg';
 import { readDVPLFile } from './readDVPLFile';
 
-BigInt.prototype.toJSON = function () {
-  return this.toString();
-};
-
 const MAX_FLOAT32 = 2 ** 127 * (2 - 2 ** -23);
 
 const vertexAttributeGLTFName: Partial<Record<VertexAttribute, string>> = {
@@ -59,8 +54,6 @@ export async function extractModel(
   const buffer = document.createBuffer();
   const materials = new Map<bigint, Material | bigint>();
 
-  writeFile('test.sc2.json', JSON.stringify(sc2, null, 2));
-
   // create materials
   await Promise.all(
     sc2['#dataNodes'].map(async (node) => {
@@ -259,10 +252,6 @@ export async function extractModel(
               );
             }
 
-            if (hierarchy.name === 'chassis_track_L') {
-              console.log(minLODDistanceBatchId);
-            }
-
             const batch =
               component['rc.renderObj']['ro.batches'][
                 minLODDistanceBatchId!.toString().padStart(4, '0')
@@ -314,7 +303,7 @@ export async function extractModel(
 
             indexedAttributes.forEach((attribute) => {
               const name = vertexAttributeGLTFName[attribute];
-              if (!name) return; // no equivalent GLTF attribute
+              if (!name || primitive.getAttribute(name)) return;
               const vertexSize = vertexAttributeGltfVectorSizes[attribute];
 
               const attributeAccessor = document