I have not understood grinding a driver bit with a wheel unless they are set up to have parallel sides up to where the bit engages the top of the slot. Otherwise they seem to damage the top of the slot by being wider at the top.

Jerry Kuhnhausen's diagram, from his book on Colt Double Actions, Vol. 2, seems to make more sense to me. The bit only engages at the bottom of the slot, the drawing is exaggerated for those that may think the bit will break.



My problem lies in reconciling my gross habits with my net income.
- Errol Flynn