I've repaired a number of the A50/1.7 lenses. The most common issue was the leaf spring being separated from the body because of the plastic aperture ring. Keeping track of that detente bearing was sometimes difficult. In the end, the best way that I found was to just smear some of the lens lubricant (grease) over it. That holds it in place nicely, since it is so small (1mm?).
You can always call Pentax Parts and order a little bag of a dozen, or find a local industrial supply and buy a bunch. They are also steel, so I always kept a magnet near the lens. It proved helpful quite often. Sincerely, Collin Brendemuehl "He is no fool who gives what he cannot keep to gain what he cannot lose" -- Jim Elliott -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
