The small spring on the drive end that is included in the splines to the driveshaft has been machined incorrectly. The spline was crooked and the details wobbled a lot, which I have a video of. I turned out to be an experienced mechanic and removed 3 wear pads from the new one and replaced the worn ones with the old one. The new spring and the rest of the assembly use a gasket that the old one didn't have, so I splined the new gasket (which was also bent), used it with the old part and all was fine. Just make sure you're looking at the pulley as you spin it to see how true it spins. It would work, but over time the transmission shaft bearings would wear out.
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