I have a Quadra 35 of unknown vintage, it has the spring starter and round rear mounting, its not on a plane at the moment but I'm building a S.P.A.d. for it, 80 inch span, profile "that looks about right" fuselage. Its going to be a "knock about" plane while I work on an old ModelTech ARC, it came without any instructions unfortunately.

Norsehammer