Be they little punches or edge punches, and no matter HOW tempting it might be,
put ANYTHING BUT paper into the punch. They are meant for paper. They will chew up and/or get really jammed with whatever you stuck in there and then you might wind up spending a LOT of valuable time trying to pry, pull, coax, and swear at the material to come out so your beloved punch can function again.
Oh, I heard all this from 'a friend'. :)
You are welcome:)