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I’m installing drag chain, and using this thing to hold an aluminum L channel:

In the process of splicing longer steppers, and in the process of installing these replacement motor mounts, I’ve had the motors on and off a few times. And every time, without exception, the 16-tooth pulley gears are loose on the shaft. I can’t get them tight; the 1.5mm hex wrench never feels snug. This makes me sad, because once they’re loose, presumably the shaft can turn until the grub screw hits one side or the other of the D flat, adding backlash. Has anyone else had this problem? Is there a secret to getting the grub screws to stick? I’m thinking of finding some other kind of screw to put in there to which I can apply some torque.