ok this will sould really okey and like you would be riggen some shit up, but i am pretty sure it would work. Just go to the hardware store take the screw that you have fine a bolt that matches the threads and get a locking nut. Go home and go to the grinder and match the bitch from the screw that you have i would do it with the nut you just bought on it that way you can just unscrew it to clean up the threads. It sounds stupid I know but I am pretty sure it would work. So, anyone that wants to tell me im stupid thats fine.