[Dadio]

I had a loss of drive yesterday and found the C clip had aligned with the drive pin and the pin had walked out ,cut a gash in the lower arm as well ,luckily i found the sleeve part and just reassembled ,ordered a new arm and made sure the C clip is 90 degrees away from the pin.
This is all quite new to me still ,is there a way to prevent this from happening again ? maybe some locktight on the C clip ?