I got one of these recently, my first MF camera. Came with a sticky shutter but I unscrewed the lens, gave the blades a good clean with cotton buds soaked in lens cleaner, gave it some heat with a hair drier and it's now perfect. Lens cleaner got in the lens behind the shutter but I opened up the aperture, put it in B mode and was able to clean it out.
My favourite camera by far.
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