I haven't had the problem with any of my Copal 0-shuttered lenses, which is good, since I don't know how to access the aperture adjustment bearing surface on those. With Copal 1 shutters, like the Fujinon 450C, it's extremely easy to remedy. Using a jeweler's screwdriver, remove the two small phillips-head screws that hold the aperture adjusting ring in place. Clean off any existing lubrication from the shutter body and now-separated ring. With a toothpick, apply a small amount of Super Lube
in several spots around the surface where the shutter and ring interface. Replace ring and screws. Voilą -- perfectly damped aperture adjustment.
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