the RB 67 pro had manual and motor backs the motor backs had a power pack that attached to base plate and they were 120/220 switchable and would work manually if the batteries failed. they work ok with grip and tripod options

you only pushed the big lever ie the back operated off the shutter double exp pin then you pushed the lever

the RB67 backs fit the other cams if you have the correct adapters eg the press camera

the foam is an irrelevant problem it lasts for 20 years you replace it... if you used the RB in cold you may need relubed sooner than refoam there is foam in the revolver as well also needs... autos need gas...

you need the manuals and you need to read...