I inserted some rubber between the pinion and spur and lifted the car by twisting the rear wheels, and then jerked. It crackled. I'm using homemade aluminum eccentric cups and didn't make them eccentric enough so max tension isn't enough. I checked my order with SDP-SI and I did buy the right ones. 6mm wide, 72 teeth and MXL.
Guess I should have made some new ones, but I found some plastic ones on Ebay for £3 so I just bought them instead. :P
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