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Author Message   Marco Rating: N/A Votes: 0 Posted on Tuesday, June 20, 2006 - 11:57 am:    Thanks for your quick reply. I did clean the helical as best I could but I did not check for the tightness of the screws. I will try that tonight. How do you remove the rubber focus ring to access the helical? I guess I am trying to understand how the focus ring couples with the helical.. Thanks Marco