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I just double checked the STL's they look correct. I have an easy test though. the back part where you took out the bearing is different between the two files. I paused your video and went frame by frame but it wasn't clear enough to see. The IE version doesn't have a rounded edge on that inner back face and it measures 3mm thick. The other version is 5mm thick and is rounded on the inner edge all the way around.

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