You should use this thread, instead of making a new one.
Loctite 648 is a retaining compound, which would retain your pulley to the motor shaft without a need for grub screw. Don’t use jb-weld.
If your hex key is stripped, then try a bigger size, or hammer in a different bit. You might have to drill it out. If you can get it out just replace the grub and put some blue loctite on it.
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