Only fix is replacement.

Seen a customer who tried the overtightening 'fix' on his rounded out cranks. Every other week he had to keep retightening, and the hole kept getting bigger. he'd use a pneumatic socket wrench. eventually gave up and showed up at my shop when it bottomed out and was still loose. Pretty darn scary, his cranks were at near 135degrees from one another...

Also seen a hilarious attempt, customer attempted to drill holes into crank arm then screw sheet metal screws into it to try and squeeze down on the spindle...

and another involving wood glue.


Just replace it.