I just received my RB67 today with one 120 back and two 220 backs. I also got a CDS Prism.
The foam seals seem to be deteriorated in that when I touch my finger on them some black residue comes off. I have just run a roll of film through the 120 back to see if there are light leaks. I called my local photo repair shop and he quoted me a price of $80 per back to change the seals. This seemed pricey especially since I could buy a used back with good seals for about the same amount. Where is there a reputable place for me to buy some foam seal kits?
The second issue is the CDS finder in that the exposure meter doesn't appear to be working. I replaced the batteries and pressed the button on the side to ensure that the batteries have a full charge. The green light came on. After moving the switch to the "On" position the needle doesn't move regardless of any changes I make to the speed or aperture. Is there anything else I can do to check to see if the meter is operative? The seller assured me that it was working fine.