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-rw-r--r--gerbonara/cad/protoboard.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/gerbonara/cad/protoboard.py b/gerbonara/cad/protoboard.py
index fa81952..004694f 100644
--- a/gerbonara/cad/protoboard.py
+++ b/gerbonara/cad/protoboard.py
@@ -27,7 +27,7 @@ class ProtoBoard(Board):
if mounting_hole_dia:
mounting_hole_offset = mounting_hole_offset or mounting_hole_dia*2
- ko = mounting_hole_offset*2
+ ko = mounting_hole_offset + mounting_hole_dia*(0.5 + 0.25)
stack = MechanicalHoleStack(mounting_hole_dia, unit=unit)
self.add(Pad(mounting_hole_offset, mounting_hole_offset, pad_stack=stack, unit=unit))