Does any one know how to remove the rotating back on one of these? I can see some discs (?) with screws in them when I rotate it, but didn't want to try until I knew. You can't pull the posts out since the bellows are fastened to that part ofbthe back. I've got a B&J 5x7 back that I want to use to replace the old-style, single-sheet filmholder type that is currently installed. Thanks for any input.
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