Here's a simple tutorial on cleaning your Rolleicord shutter. These cameras come in all types of shutters, but this is how I cleaned the one on this particular model. Usually, all that's needed is to unscrew the front lens element and carefully clean the shutter blades w/ a Q-tip wetted w/ lighter fluid, then quickly cleaned up w/ a clean Q-tip. You'll need to get the oil/gunk off the back of the blades as well, but if you're patient and careful (lucky) you can just keep cleaning one side and let the shutter blades get wetted w/ fluid, so that it goes over to the back side of the blades. Just keep at it, and use about 20 Q-tips or so. Any fluid that gets on the back element can be cleaned off w/ the shutter on 'B' and a Q-tip through the open shutter. Unfortunately, this didn't work on this shutter. It was still hanging open on all the speeds even after the cleaning, so I had to go a little deeper.