Re: Spartite and new mast boot
The mast boots are pretty stretchy. I think you should be able to work it over the spartite wedge.
Even if you have to cut the top a little larger, it shouldn't hurt the boot if you clamp it and goop it correctly.
I think you would be better off leaving the spartite wedge intact rather than making it looser. It should still be fairly water tight if you use some silicone when you slide everything back into position.