@mikepilk glad I found your old post where you asked about exactly this.
I have now had the same realization - I don't want to make a practice of marring screwheads. I'd rather undercut or file the slot. What did you decide on? Did you find the right file for the job? Thanks.
Hi there JD, that is what you call a bumper movement
A bumper movement is a type of self-winding, automatic movement.
However, unlike a modern automatic, which has the rotor spins a full 360 degrees, a bumper moves back and forth at about 120 degrees.They are fun to wear. You can feel a slight thud as you turn your wrist reminding you that you are wearing a bumper. It is an interesting method to wind the watch that avoids infringing on full rotor patents.Hope that helps
thanks, yes that's what I was thinking of. What the heck, I'll bite the bullet.
yes I would assume I would have to remove the hairspring. Not sure how I'm gonna hold it... Between a stump and a hollow punch on the staking set? Just spitballing here, did not think that far ahead!