I have an older version of the O.S. Wankel .30 engine. I am in need of a muffler. It has a clamp on one side and a holding screw on the other side. In trying to tighten the clamp it broke. The muffler offered by Tower Hobbies is a newer version with holding screws on both sides of the muffler inlet. It will not fit over the outlet on the engine. Any ideas where I can get a muffler for this engine? Thanks! Daytonflyer