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Author Message   Marco Tinkerer Username: Marco Post Number: 19 Registered: 10-2006 Rating: N/A Votes: 0 Posted on Wednesday, June 30, 2010 - 11:57 am:    I cannot remove the dust cap from my 24/2.8 chrome nose. Both cap and breech ring are stuck solid. Upon closer examination one of the cap lugs is visible but not protruding, suggesting careless handling. Cap is Canon original. f/stop and distance rings move freely. No amount of reasonable wiggling will produce any movement of either. Before resorting to brute force I seem to have three alternatives: (a) removing (or just loosening) the two breech ring retaining screws, without knowing the effect or what to do afterwards; (b) setting the diaphragm ring to the green circle Auto stop, ditto.; (c) ask the forum for help. I’d appreciate any guidance before resorting to (a) or (b) or else, excluding reaching for the sledge hammer. Many thanks in advance.