I got my first set today and can't wait! Just a couple questions. I'm making my first wooden covers with exposed poles. Do the spacers double as the template for drilling the holes? Do the pickups need to be sealed after being put in the covers? I've done a few searches (which came up very informative), but i'm still a little unclear and i DO NOT want to ruin these pickups. I know there's quite a few builders that have used them and i could use the advice. Thanks so much!