Yep I've had mine jump off quite a few times, it's a right pain in the ass to get the chain back out. It jams behind the crosshead screw holding the bashplate on. I thought about putting a larger headed screw in to stop the chain getting past, but when I started to unscrew the screw it didn't want to come right out, as tho there was a nut on the end, so I stopped. Maybe some kind of larger diameter inner ring could be sourced or fabricated.
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