I have yellow *& red Ringmaster with OS35S purchased at local swap meet. It was scratch built . The AMA # on wing is 10760 . The owners / builder name, Bruce. I believe he is member Philly Fliers.
I'd like to contact Bruce with technical question, but have no contact info.
Not sure if Bruce reads ST postings. Please send PM to contact me or share his contact info.
Thx, Lyle