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Author Message   Paul_c Tinkerer Username: Paul_c Post Number: 11 Registered: 02-2010 Rating: N/A Votes: 0 Posted on Monday, April 12, 2010 - 02:58 am:    The front lens elements should be one piece(see first picture)But on my GSN they unscrew apart so You have to dril(1 mm)holes in the retainingring to get the second lenselement out(see second picture,ring left below) regards,