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Author Message   Br1078lum Tinkerer Username: Br1078lum Post Number: 254 Registered: 11-2010 Rating: N/A Votes: 0 Posted on Tuesday, March 13, 2012 - 01:40 pm:    I've got a Ricoh 300 that what Spdtwn described happened to. The Riken shutter has one long arm that reaches all the way from the top of the shutter mount, to around the four o'clock position (going the long way around on the left side) where it engages a catch on the speed escapement. It developed a burr there, and would catch, not allowing the arm to return to it's proper position when firing the shutter. I also have a Zeiss Inconta with a Klio shutter that did the same thing, only in another part of the mechanism. These are metal parts beating on other metal parts, and act like a hammer in a blacksmiths shop. Whichever is the weakest will give way, and create those burrs that get caught on other moving parts. PF