Punching rubber flip-flops.
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Previously:
https://www.homemadetools.net/forum/...257#post176902
https://www.homemadetools.net/forum/...500#post170039
https://www.homemadetools.net/forum/...579#post159016
https://www.homemadetools.net/forum/...741#post152100
https://www.homemadetools.net/forum/...152#post115730