There are a lot of pins going through the masthead, but only one through-bolt. And if you tighten it too much, it pinches the sheaves. (Guess how I know?)
Epoxy seems like a good idea, though one could probably find places to drive in some self-tapping screws, if they didn’t interfere with the toggles or sheaves.
Speaking of which, looks like I’m headed back up the mast again this week - the wind instrument has assumed a decidedly cock-eyed attitude. Apparently something wrong with one of the mounting screws. I just wish I had noticed it before the daily 30-knot winds came back. (The only two days of the summer without big winds were last weekend, when people came to town for the “Double Dammed Race,” which they actually cancelled for lack of wind. Last night’s club race appeared to be cancelled for too much wind.)