diff --git a/coil_generator-12.ipynb b/coil_generator-12.ipynb
index 39e726f..12799cd 100644
--- a/coil_generator-12.ipynb
+++ b/coil_generator-12.ipynb
@@ -78,7 +78,7 @@
     "\n",
     "# PCB Edge size\n",
     "STATOR_RADIUS = 25\n",
-    "STATOR_HOLE_RADIUS = 5.5\n",
+    "STATOR_HOLE_RADIUS = 10\n",
     "\n",
     "# where to puth the mounting pins\n",
     "SCREW_HOLE_DRILL_DIAM = 2.3  # 2.3mm drill for a 2mm screw\n",
@@ -123,14 +123,14 @@
     "# where to put the input pads\n",
     "INPUT_PAD_RADIUS = STATOR_RADIUS - (PAD_WIDTH / 2 + VIA_DIAM + TRACK_SPACING)\n",
     "\n",
-    "USE_SPIRAL = True\n",
+    "USE_SPIRAL = False\n",
     "\n",
     "if USE_SPIRAL:\n",
     "    TURNS = 18\n",
     "    COIL_VIA_RADIUS = 20.5\n",
     "    COIL_CENTER_RADIUS = 20.5\n",
     "\n",
-    "LAYERS = 4"
+    "LAYERS = 8"
    ]
   },
   {
@@ -714,7 +714,7 @@
   },
   "vscode": {
    "interpreter": {
-    "hash": "fc384f9db26c31784edfba3761ba3d2c7b2f9b8a63e03a9eb0778fc35334efe1"
+    "hash": "1ce20143987840b9786ebb5907032c9c3a8efacbb887dbb0ebc4934f2ad26cb3"
    }
   }
  },