So... I now have all the parts for the DA-85 retrofit. Kevin at Jtech did me right with the custom muff. He even put a third stack in there for better breathing. Received the Sierra Giant scale prop shaft extension and drill guide. Received the ignition battery eliminator from TBM. Also got the DA recommended Menz 26-10 break-in prop and exhaust gaskets from DA. So what oil should I be using? LOL!