J2 and J3 use shaft couplers that require blue loctite and aiming for a hole in the shaft with set screw. Also set screws NEED to be tightened a lot and you should let blue loctite cure for some time. Failing to follow this will result in wobbly robot.
fwiw, I used a small drill to create a divot in the gearbox shaft for the other setscrew to tighten into. A bit more fiddly, but it's a closer fit than the keyway so there's no slop even without locktite. That coupler isn't going to move on the shaft without shearing a setscrew now.
Awesome, good to know 👍
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