Fellow called wanting piston rings for a 1937 Waterwitch twin, 4hp, may be model 571-20. Anyone have dimensions for one, so I know what to look for? Or does some one have them?
My suggestion would be that once you are sure what motor you’re talking about, contact Peter Feldman who is the Waterwitch Special Interest Group Leader. He may be able to tell you what size ring is needed. Once you know that, I’d try Otto Rings. http://www.ringspacers.com/