I'll recommend Paul Ebel, and of course Fleenor at Oceanside Camera.
Krimar Camera butchered my 2.8C, and did work/installed parts without authorization to the tune of over $150 (along with more money for the butchered focus system work, plus postage when sent back for a second round of repair even). His initial response when I called to talk about the botched repair- well, it's an old camera, hard to get parts. "Then why did you put new parts in a camera that is worn out in one of its basic functions?" "Ok, send it back...." I know he has done well for many many people, but I wouldn't trust him with anything as old as a Rolleicord IV, being the same vintage as my 2.8C.
Harry Fleenor cleaned up Krimar's mistakes and made everything nice. If you want it done right by someone who will stand behind his work and has an international reputation, Fleenor's it.