Olive Chrome Ivan bag: Planet Bike saddle pouch: Mastercraft 15mm wrench Simson Patch kit from Morgan Filzer mutli tool Takx tire levers x2 Park Tri spoke wrench Filzer chainring bolt tool Park CT-5 Two Spare KMC 710 links and master link Tube with at least 3 patches, in xmas bag Husky box cutter 'winerbiner' bottle opener NYC bike map Planet Bike Mini pump 85psi max Construction zip ties Wallet Brackberry 8120 [full of metal, electro, pron and Aqua Teen] Keys Brackberry stereo headset Blistex Kingston 1GB data traveller [more metal] Found Bic lighter Baggie of Ibuprophen Twin tip Sharpie marker MEC Turbo Turle White MEC Turbo Turle Red Planet Bike 7 Planet Bike Superfrash Cateye Opticube 510 Water bottle Onguard lock and cable [sometimes two U locks depending on locking duration] Mellow Johnnies Cap [containing sunglasses] Thin black toque Ankle Tensor Descente neoprene toe booties Spare wool socks Spare gloves Mec commutard shell [bound with toe clip strap] Not Shown: Current book 'Motorized Obsessions: Life Liberty and the Small Bore Engine' Emergency rations 'Sweet desire' nut mix

... so it was deduced that the front cell group of the lens is a self-contained entity. The lens was protected by a piece of card held on with 3M tape, and using only 'hand-held' leverage, the assembly was cautiously unscrewed with the aid of a small strap-wrench. The assembly came unstuck from its installed position with the application of only moderate, if unquantified, torque.