Angles
Hi,
First, the large Harken restrainer will gain you a fraction of an inch, but it seems unlikely that this will give you appreciably more clearance, since it won't increase the halyard angle much. So I'm more inclined to look at the sheave first. What is the current tread depth? If that wire notch is even as little as 1/4", and if the rope notch is also deeper than it needs to be, then you might be able to push the lead significantly closer to the forward face of the mast. It is possible that the overall diameter of the sheave can't be increased (though double-check that), but the tread depth can.
Then I'd look at restrainer location: is it now positioned to give a good lead to the swivel, when the swivel is about 4" from the top of the foil? This assumes that the foil is right up close to the upper terminal. Many restrainers are too low for proper lead of halyard to swivel.
Finally, if you still need to adjust the mast mortise, cut big. That is, instead of filing a notch, which is a stress riser, cut a nice, deep radius, something that matches the mortise width at the top.
Fair leads,
Brion Toss
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