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Author Message   Glenn Tinkerer Username: Glenn Post Number: 296 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Sunday, March 09, 2008 - 06:34 pm:    Steve, You are misguided in thinking the slit width needs to increase as the curtains move across the gate. As Rick previously stated - set up the curtain tensions so that both curtains move at the same speed. If you are having problems in this area, you should check for wear/damage in the mechanism. Curtain 'shimming' plays no part in setting up focal plane shutters of this type.