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IMO, The washer hole should be as tight to the pin diameter as possible. The closer the pin is
to the size of the washer hole the less rivet effect you need and the closer to the washer
you can...

,,,depth gauge... hmm...

You can stack some extra washers as a depth gauge, then cut as flush
as you can and file it smooth to remove all but the one you need
from the stack and then tap tap. ...

First set of scales.

:bow:bow