RE: servos, attaching prop to engine
OoOoOoOooo...O.K., left hand. Have you contacted Wackerengines? will they make one for you? -or-
Do you have access to a machine shop? Take your clutch piece to a machine shop and see what it would cost to have a prop adapter made with those threads. the adapter would have to be long enough for the prop to clear the muffler.