Have you done this sort of thing yourself?

The Rollei 3.5f is a fairly complex camera. I'm not suggesting you aren't up to it, but it can take a fair bit of time
and effort to do even simple things.

I think most of us would rather take pictures. The Rolleiflex 3.5f is one lovely camera.

There are manuals available on line for these things. Try- http://www.kyphoto.com/classics/repairmanuals.html