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@fusionisthefuture
actually, i never saw those phil cogs before, but i guess what i would do now, knowing they exist, and if i didnt have access to a CNC, is buy one of those and just put it on a lathe and cut out the inside of it with a o-ring groove cutting tool until there are some holes between the teeth where there should be. i wonder why phil doesnt... maybe its patented?