The only point I do not understand in your Jig is how the washer is fixed in the correct position and what prevents it from moving after each letter is stamped.
From
Stamping JIg Instructions Manual:
Once the washer is inserted, rotate the BitJig to the lock position, securing it firmly, note that the washer holder inside the base moves down
I assume there's some thread inside to "clamp" the washer in place, but I can't envision how that works since the washer fits through the hole of the base that moves down.
Exactly.
Still, I don't understand how it is clamped, avoiding unwarranted movements.
I don't know if it is an industrial secret, but it would be nice to know more.
I guess this is one of the most critical aspects for a good jig.