RB67 help...

Couple drops of lighter fluid will loosen it up.

Is your dark slide notched to set the interlock properly?

Older RBs didn't have this feature and were un-notched.... when used in Pro or better, the un-notched DS over rides the interlocks.

Thanks Paul...yes, that's precisely what I did and it appears to have worked. I know I may need to do it again as that's what happened with the graflex..needed a second treatment when the shutter was sticking