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Author Message   Prasanna Tinkerer Username: Prasanna Post Number: 87 Registered: 10-2009 Rating: N/A Votes: 0 Posted on Tuesday, February 19, 2013 - 07:06 am:    I use petrol or kerosene drops where the brass ring sits on the chromed metal. After soaking overnight you can turn the thread almost by your fingers. Try not to use force. Just dissolving the dirt and gum will ease the ring out. I have worked on several Zorkis and Feds in this way. Later when you re-assemble pleas use some thin oil on the grooves after cleaning them. And please do not tighten with a wrench. Finger torque is sufficient. Best of luck.