Attached to some Sunbrella canvas outdoor curtains to allow tying of weighted bags. The only problem I had was that the punch and bottom part bounced when hit with a hammer. Considering that it takes multiple hits to do this, and unless your hammer hit is exactly square, that hit (and its sharp edge of the center circle) can fly - towards the hand holding the material/parts. As a result, I got the worst cut (on my thumb) in years. I recommend wearing a heavy duty glove for both hands near the stamp. I don't see a set design issue, but I should have figured out how that could happen after the first two views.
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