Very interesting thread Marie! I learn so much from watching you try things, as we are both shorter gals and standard stuff does not really fit. Fascinating that you are liking doubles after trying sidemount. I love my steel HP80 almost as much as my old 72’s. I say drill the hole, it can’t hurt to have an extra hole, but have a local metal shop do it on a drill press, unless you have one, and if you do have a drill press mark the hole with a center punch, use a sharp drill bit, clamp the plate, use oil to lube. Stainless is hard.