diff --git a/snap_on_templates.py b/snap_on_templates.py
index 177aed1..2ae2e9a 100644
--- a/snap_on_templates.py
+++ b/snap_on_templates.py
@@ -25,7 +25,6 @@ back_thickness = 1.5
 # this number is somewhat estimated, but quite important
 # it is the offset from the end of the pliers to the point of the cutter
 lishi_cutter_offset = .54 * MM_PER_IN
-key_guide_width = 15
 key_guide_height = 12.5
 
 notch_width = 1
@@ -34,6 +33,8 @@ notch_depth = 0.5
 
 
 def lishi_template(spec: BittingSpecification, name: str, depth: float):
+    key_guide_width = lishi_width/2 + side_thickness + spec.TFC - spec.BCC/2
+
     result = (
         cq
         .Workplane("front")