Thanks for the offer of help, I might need it...
It is very easy to open. There are 2 screws one at each corner on the top, two more on the underside by the spool. Once those are out, take off the dot of leatherete on the lever and unscrew the large center screw. The lever should pick up but be carefull to not lift the winder or you will lose the spring tension. No problem putting it back as you will figire it out sooner or later that it catches the matal plate that sits on the spindle.
Whe taking the top off, watch for the little slip of metal that covers the hole on the lever side. That has to slip into the slot, just as you will need to do when reassembling it. I put the insert in multi froame more so it will retract the slip of metal, it makes it easier to remove the over.
Your problem soounds like the small lever that hits the edge of the shell is not engaging properly. That will be on the counter side near the top.
Put the insert with the lever reinstalled into the shell loaded with a test roll of film, just the paper backing is enough and try cocking n firing it to see how everything works together.
BTW while it is open install new seals before reassembly, it makes it so much easier to do.
When I got my Rb I read about the seals being bad on those cameras. They mentioned foam and felt. I dug out the old foam and went down to Wal-mart and bought some felt. I comes in a 12 in. X 12 in. square or there abouts. I cut it with a hair cutting scissors and glued it in with rubber cement. It has worked great and I haven't seen any light leaks. I repaired another one that way but haven't tried it out yet. If the door doesn't close, I just pulled out some and replaced it until it did. You can buy those expensive foams seals but they will eventually turn to gum where as the felt won't. I haven't heard any reason not to use it, so if it isn't a good idea, stay with the foam. Ric.