Several HOURS filing a square hole!?
Bob Roller
Yes, Bob, I'm slow. And my files are dull.
I use magic marker on the tumbler square and fit and file the hole until I get good contact all over. I fit until the hammer is close to shouldering up, saving the last little bit for pressing on.
Never had a hammer go wobbly on me, even after thousands of shots.
If there is a faster way, and if it's better, I'll adopt it.