I would also add that spartite is perfectly repeatable. Once you get the mast where you want it every time you yank the mast it goes right back to where it was. Even the best wedges will have some play in how they fit each time TH smast comes in and out.
Admittedly this is a bigger issue for boats that pull their mast regularly, but when retuning a rig it's nice to know that you at least don't have to deal with one problem.
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