on my mast (mystere 5.5) I use a 1mm (maybe 2) dyneema bale (that is secured through a small hole I drilled in my mast track on each side, and hang my hoist block on it. This way the block can rotate a little bit on the bale when the mast is turning.
It also give me the ability to move the block up or down an inch or so if I change out the spin to one that is slightly different in size