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Author Message   Waynemel Tinkerer Username: Waynemel Post Number: 141 Registered: 08-2009 Rating: N/A Votes: 0 Posted on Tuesday, January 24, 2012 - 05:23 am:    I was thinking the same thing. As if an oil or something has worked it's way between the elements. The circle is perfectly round, but is slightly off centre. Unfortunately I am having a hard time removing the rear element so I can't get a better look.