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.
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.
As LoyceV said, there is a threaded piece inside, which allows you to secure the washer. That piece has an inner diameter, which is slightly smaller than the washer's diameter, so it locks the washer when the jig is fully rotated to the lock position. In order to introduce the washer (which has a larger diameter as we already know), it is possible because this threaded piece which "clamps" the washer, has several lateral "gaps" which provide a slightly larger diameter than the washer. Therefore it can be introduced if the washer is rotated vertically when the jig is at the fully "unlocked" position (pictures on pages 4-5 of the manual might help you visualize it). Tolerances are quite tight though, there were a few iterations...
We got a review last week from a substacker who wanted to test it, you can check the 4th image, which shows it better (it is in Spanish though, but you can translate it)
https://cryptosecurity.substack.com/p/hide-your-keys