Seems like you can still buy pinex tiles (https://revivebuildingrecyclers.co.n...ts/pined-tiles) , I've got some board similar but its quite a pain to cut and comes out at 17mm with the same 22mm hole saw, so undersized for 12 gauge which should be a smidge over 18mm just converting the numbers from inches,
hopefully someone has a decent idea for cutting them.
I think I've got the overshot card sorted doing it like you described, just have to get some decent punches as the ones I brought wouldn't cut the cereal box I was using. was just stuck on the wads, maybe someone has a tool they wouldn't mind duplicating for me.
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