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Nope, its from not being screwed down completely tight
Well, yeah, that would equal grinding type stress.
The threads inside the ball were mostly there but opened up and broken in several places. Maybe the mast ball unthreads itself some during rotation and needs tightening down periodically. As you say, it's worth checking regularly...
However, the problem still is that those threads probably aren't made to withstand the big upward leverage that putting a mast support up close to the rear crossbar puts on them. You got 7' of mast between the mast ball and crutch and 22' between the crutch and the top of the mast. For this reason, I moved the mast support back about to midway. I got this vision of mast balls popping into the air now...
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I just tie it off right at the dolphin striker on the boat, then to the mast rotator where it connects to the mast base.
Gotta ask -- Doesn't mess up the mast rotation?