by GWiens2001 » 21 Dec 2020 22:22
Some cutaways are made using larger mills to cut away the bulk of the material, then something finer to cut to the pin channel.
I am not a machinist, so am only trying to offer ideas that may or may not be practical.
Gordon
Just when you finally think you have learned it all, that is when you learn that you don't know anything yet.