I just bought 2 RB67's from the big auction site. One has a 90mm lens and the other a 180mm lens. I did notice that the camera with the 90mm lens takes a little more effort to cock the shutter than the one that has the 180mm. This may be normal, I'm not sure. Shutter speeds sound OK. The body cocks OK with the lens off and the lens cocks ok when it is off the body. Only seems to bind some when they are together. I'm planning on doing a CLA on them but i haven't worked on these before. Is there a service manual available for these that I can download? Is there anything else I should look at while i'm servicing these two while I'm waiting for the light seals to arrive? Everything on these 2 cameras seems to work but they have been sitting for awhile so I'd rather service them now before loading them and trying to take a few test frames.