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Author Message   Brcamera Tinkerer Username: Brcamera Post Number: 156 Registered: 08-2010 Rating: N/A Votes: 0 Posted on Sunday, February 26, 2012 - 05:39 pm:    The shutter will probably work without the escapement shim installed, but as for it working well or for a long time, that's another question. For those who aren't familiar with this shim, here is some info on how it is used: On this Copal shutter, each end of the speeds escapement is attached with a screw and a shim to the mechanism plate. These shims, although not very thick (app. .003"), help to align the contact surfaces of the main cam and the retarding lever on the escapement. If these surfaces are not aligned, full contact of the escapement is not made and this could result in speeds not being able to be calibrated and certainly could lead to premature wear on the retarding lever pivots. As a practical matter, this might not matter to some folks today who are not critical users of the camera/shutter , but it really is best to restore a shutter to manufacturers specs if at all possible. Bill