Hey, I'll second a vote for Smolov ( 123camerarepair@gmail.com ). I've sent him two cameras in the past two months, a Pentacon 6 TL and a Yashicamat. (Not Rollei's, but MF bodies.) Both came back quickly, very reasonably priced, and they work flawlessly.
True the dings are still in the case; I paid to get them fixed, not restored to museum condition. But the mechanics are spot on. They both work first time every time now.
Some camera shops such as percificrimcamera.com do have part cameras to sell. You can check with them. In any event, your best bet would be to look all over the place for a tatty or condemned one with that crank intact.