run a hack saw throught the slot that the bolt pulls up so that you can get more clamping pressure , this'll work for a while but you may have to replace it
Clean it all up. Use some blue loctite on the threads. Snug it up well. Install the circlip which acts as a backup in the event that the bolt backs out.
run a hack saw throught the slot that the bolt pulls up so that you can get more clamping pressure , this'll work for a while but you may have to replace it