well here is the superior rotary-ray is not makeing them right now ,some other company is.
Well I put in a new motor with caps and rewired for rca-have a new brass nut comeing in for it instead of the aluminum one . long stroke and runs smooth with bands,needlerunner or the machines spring setup.
http://www.youtube.com/watch?v=erSjgy0ACl0
springsetup