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Author Message   Johnlees45 Tinkerer Username: Johnlees45 Post Number: 43 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Saturday, June 23, 2007 - 02:41 pm:    I have a Praktica PB 4-5.6/70-210 Pentacon zoom lens whose aperture ring suddenly has no definite "stop" positions any more, i.e. the aperture ring does not "click" into any notches. The lens still seems to work but the ring is now too easily moved. I am new to working on lenses. Is this a simple DIY job or is there more to it? Many thanks to all, John.