Note to future builders- If you're reading this, do yourself a favor and go through Van's online catalogue before each kit order. I saw an RV in an avionics shop a couple of weeks ago that had this mount, went looking online, and sure enough, it's in the Vans catalogue for $15 bucks. If had known that they had an off the shelf ELT mount available, I could have included it in the fuse order and saved myself the individual shipping. At any rate, this seems a lot easier to install now, so I ordered it a few days ago. At first, I was a little confused because the print & instructions show it going on the left side, but I was sure it went on the right side. Playing with the bracket for a few minutes verified it would only fit on the right side. I went back to the catalogue and discovered I had forgotten that you could order a left or right version that are mirrored. I wanted the right side and that's what I ordered, but the instructions in the bag were for the left side. Vans sent me the right kit, but the wrong instructions. No problem, just reverse from the plans as appropriate. Match drilling this is tight. Would have been a huge hassle without a 90* drill motor. I don't know what I'd do without that thing. I don't use it very often, but boy, when you need it, it sure does make stuff a ton easier. Anyway, I match drilled the bottom, then measured and drilled the top per instructions. Removed to debur & install nut plates. There are two different hole patterns in the bracket, one set for an ELT mount and a different set if you're going to use it to mount a strobe power pack. carefully reviewed the print to make sure I was putting nutplates in the correct 4 holes. The lower 4 flange holes don't have access to get a rivet puller up from the bottom, so I pulled the top side out enough to get my puller in behind and pull them from above. The snout of the puller is too big to fit down between the J-channel stiffener and the skin, so I stacked 1/2 dozen washers on the rivet stem to get the puller to stand off from the rivet head enough that I could get the rivet to sit down in the hole without bending the j channel with the tip of the puller. The washers are actually the little ones that snap off the heads of a cherry rivet that I had saved for just such an occasion. I taped them together with a strip of electrical tape so they wouldn't fly all over the place when the stem popped. One more little task done!