sounds like you have it on the wrong side, so it keeps unscrewing itself
check the end of the shaft - it should have an L or R inscribed on it for Left or Right
No, it's on the right side (I've checked, that's the type of mistake I usually make :. The issue is that we didn't have the tools to bolt it on tight enough. It's one of those odd systems that that turns with the pedal, and that requires pressure to stay on. Since it's currently bolted on using only my fingers, any bumpy road will just shake it loose again.