Anti Sieze Compound
When mounting the Windex, if you drill and tap for screws I'd recommend using an anti-sieze compound of which there a a couple on the market. West maine sells one called Anti-Seze by Permatex and there is another one I just bought last week called something like Lanoline, recommended by Forespar for lubing their plastic seacocks which I understand is also very good on metals.The mast head is made of aluminum so in lieu of drilling and taping (aluminum requires a different taping oil than steel or the metal will gall up on the tap and possibly break it), consider thru drilling and using Nylac nuts or nuts with Loc-tite, or both. Even if nuts are used I'd recommend an anti-sieze compound to help prevent galvanic action between the steel and aluminum.The next trick is getting the wires evenly lined up with the way you like to sail close-hauled; probably will require another trip or two up the mast.