Isolation good
Hello,
Isolate everything, even aluminum in contact with aluminum, as different alloys are likely in play, and they have different electrical potentials. Plus of course there are stainless screws going through both. Use materials that won't ever allow water intrusion (Tef-Gel, UHMW); many plastics, for instance, will absorb water, so no coffee can lid.
As for the leads, give serious though to internalizing the halyards: you'll halve the possibility of skying; reduce windage; and guarantee fair leads. I like to reverse the traditional order of belays for internal halyards, to get fairer leads inside the mast on the way to the winches; as I understand it, the conventional external arrangement is the way it is because that way you'll get something like a fair lead to a clockwise winch.
Fair leads,
Brion Toss
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