I taped blue tape around the hole and found the hole center with a square. I then drew a center line. I cheated the pipe up a hair in the hole then marked and drilled a pilot hole followed by the 11/64 drill bit all what paying close attention to drill angle(keeping it slightly up.) I then used the wood screw to tighten up the pipe on the top hole. Once the kid and I decided what was straight I took the sharpe and eyeballed the next two holes in the slots and drilled them out. I bought 1/4-20 SS machine screws, but thinking I will down size to 3/16 tomorrow so we scrapped install. I decided I had better fit that exhaust hose in because it would be extremely difficult to do with exhaust in. I used spray away glass cleaner to lube the tube and shovel the baffle pipe in engine side to the sharpe mark I made. We then lubed the other tube up and fussed and cussed it in but me bending and rotating with neighbor shoving it in with hand from transom hole. Tomorrow we final drill, test fit, then lube and goo.