Decent screws and washers. I've gone to m3 bolts with 2.5mm hex heads in a capped washer, far better than the button heads it had before! Similar to the Lunsford ones above.
Make sure the motor plate is flat and clean, Make sure the motor end bell is also flat and clean, make sure any features on the end bell don't catch on the motor plate (some of them have bearing housings that stick out)
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