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Author Message   Glenn Tinkerer Username: Glenn Post Number: 933 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Monday, June 13, 2011 - 01:14 pm:    The ball bearings in the rear of the lens are no problem if you remove the aperture actuating lever assembly complete. You remove the three radially placed crosshead screws in the finger grip ring, that retain the stainless steel bayonet ring - these screws are torqued up really tight, so use a proper sized bit in a handle with a large grip. lever out the ring and then lift out the actuating assembly complete. Never remove the three small radially placed screws that are in the portion of the actuator that protrudes beyond the stainless bayonet ring - unless you want to search the carpet with a magnet for a week collecting balls. Ronnie I would leave the lens alone unless the focus is rough or sloppy. There is no actual adjustment on the 'key' that stops the inner helix rotating as you focus the lens in and out, regreasing will help by filling up the 'keyway' for a while, but this is not really a problem so leave well alone.