OK..so..I guess it is a RK then! Darn...But still,wouldn't it be one of the very first RK's ?I tried putting a later, 2 pad red felt Sling muffler in..wouldn't go..When I tried this green pad one...it went...Would that actually be the correct muffler then for a 1936-7 RK?A fluke,if so,that I just happened to have one in my parts...Thanks for all the info so far Mark!
Yes, looks like an early RK ('36). There is a slight difference between the various twin pad mufflers and the holes often will not line up. A Broadcaster muffler has very widely spaced holes and will definitely not fit. Glad to help!