Regarding gaskets, for a product we were making in California (and maybe here in the future) we needed a food grade gasket of a specific size. With supplies getting tight even then, it was hard to find anyone offering customs made from food-grade soft plastic. Tried Chinese ones but their sizes were similar to what we needed, not exact and the plastic was too hard.
So... I turned a punch out of a piece of drill rod. Two parts, the center to cut the hole slipped through the center of the larger outer one. Use an arbor press to cut against a scrap piece of plastic and it worked great.
The gasket material is a dense closed cell foam used to wrap apples, pears, etc.
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