Thanks so much! That makes perfect sense! Essentially, by not sliding the mast fully onto the hinge-pin, I was “simulating” the pin hitting the “stop-screw”. This also explains why when I was looking at the mast base yesterday, I looked up in the hinge-pin sleeve just to see if I “happened to notice something” and I did see 2 drilled holes in the mast sleeve, which meant nothing to me at the time, but now I realize that one of those two holes is where the stop-screw is supposed to go. I’ll put a screw in the one that aligns the hinge-pin base with the mast base. You don’t happen to know what the second hole is for, do you?