The launch lugs are going to have to stand off the ST-115 just slightly, because there’s this ridiculous tiny piece of BT-55 going in at the front. Only a tenth of an inch larger diameter, but there you are. I don’t have a punch the right size and strength to make the needed hole in the centering rings. So I drilled, put thin CA on and let it harden, and drilled again. For the other centering ring I punched a smaller notch, applied thin CA, and then filed it larger.There’s a bit of a snag here: The centering rings are too far apart for any of the 3/16″ lugs I have. Don’t know how I missed that. So I’ll get some longer ones — hopefully those and a few other parts will come back from Dayton with me after NARCON. It’s probably time to switch back to the front end now.