Get your groove back
Sometimes the threads on the end of a bolt can get dinged-up, leaving you with no way of threading a nut onto the end of it. But there’s an easy fix to get your bolt back in working order, if you have access to a grinder. Gently hold the bolt up to the grinder at an angle and taper the end. This will restore the groove and allow the nut to be threaded back onto the bolt.
Check out the demonstration below and check out this story for more grinding tips.