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Dave,After you cut the slots did you put the ring on a mandrill and squeeze it shut then turn the OD to your cylinder size? Or did you not worry about the ring being slightly out of round when compressed?I'm thinking pretty seriously about a Teflon ring in the Goulds pump and this thread has given me lots to think about and learn.Thanks,Dave
Maybe 'Rulon' might be an alternative to PFTE, I have been told Aster use it in some of their gauge one locos, as a first stop try; www.polymer plastics.com for some info. Paul Gough.