Yep, that was something that came out in testing. The first set he sent me had a stud design (with a good nylon nut). This "second" set has a bolt design with course threads that threads into a nut that's welded into the UB Skidder.. and it worked it's way loose over the course of a few weeks.

Put it back in with some locktite and off I went.

The intent of switching was to reduce the amount of exposure. Those end threads are exposed a bit by a "post" type design, but switching the design around introduces more potential for harm than good.

I just came back from two days on the beach at OBX III and it has yet to work loose.

"Bad bad design..." I wouldn't go that far, because it's already been fixed. The production model will switch the design back the way it was previously.