XRAY - Model racing cars

if there not smooth i think its gonna need new balls.

i also have had this problem it would be fine for the first 2 races and loosen right off in the third all i did was tighten it back up and it was ok so i now check my diff tightness before each race. it would be nice though if there was an answer for it because it is very frustrating when it loosens half way through a race.

Thanks guys. The balls look fine and they are ceramic so no problems there. I rebuilt them again and they feel pretty smooth, so we will see how they do next Friday. It wouldn't be so bad if they loosened after a couple races, but after 3 laps with a 9 turn is just to fast!