How to fix stripped 17mm wheel hex?

[Patrick]

I epxoyed one of my 17mm rim hexes that was rounded about 3/4 of the way into the wheel (nut came loose and only rounded part of the rim). I put a film of grease on the wheel hex so the epoxy wouldn't stick to it and I could pull it back out of the rim easily.
It worked well for me, but maybe if yours are badly rounded put some grooves in the rim a bit like aqwut did, then the epoxy should have more chance of holding onto the rim. Does JB weld work on plastic? Maybe that is stronger than epoxy.