I use a drill with a clutch and turn it down. Go slow and steady.
If its something really small like the hentzi were, I'll poke a hole using this tool I have that looks like a big needle.
Anything around 1/4" - 1/2", I use a 5/64 drill bit. The pre punched cups, those hole are too big.
Anything needing bigger holes than that I go to 1" vents.








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