It's okay if you use it. For yourself.

How long it will keep you from having to get something else is a entirely different question. You might get to save some money for a while or you might have to spend it after the next ride.

It could be fixed somewhat with a insert. Such as a heli-coil. 9/16-20 left hand thread. I don't know how easy they are to find. Might need a left hand drill bit too! <grin>