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Author Message   Sevo Tinkerer Username: Sevo Post Number: 15 Registered: 09-2008 Rating: N/A Votes: 0 Posted on Thursday, November 13, 2008 - 09:15 am:    Ah, right. You need a slot tip lens wrench (spanner wrench) to unscrew the retaining ring - there are two small slots in the ring, one is visible above the "3" in the picture. If the ring is not stuck, you should also be able to make do with a caliper.