This has been a minor problem for years
All moses masts all current fuses, (but unknown if race fuse and havock mast is the same)
I was driven mad by this annoying loose front bolt mystery,
and can tell you there was nothing I did not try, even adding grub screws through the side of the the fuse to clamp up the neck of the front securing bolt, all manner of washers, screw lock blue and red, no grease, arghhhh!
solution was more than easy, and has worked faultlessly since
board upside down mast attached
wingset fully assembled separately
ensure connection points are spotless
place wingset in place and listen for that clean sound of a good connection, no gritty crunchy sounds of trapped sand.
check washers are in place and screw up evenly, ideally use a high quality T handle allen head driver like this - https://www.ebay.co.uk/itm/Teng-Tools-T ... 0048076962
tighten to a good pressure only using 3 fingers on the bar,
the next step need to be done with either the wing covers left on or use a dry clean cloth in both hands to prevent transferring skin oil or sun tan oils to the wing surfaces.
grab both wings firmly and rock your weight back and forth over the wing set a few times,
you will then find that when you try and retighten the mast screws using the exact same force as before they will both tighten up just slightly more,
very satisfying,as its this simple routine that keeps the little buggers good and tight, 100% of my sessions