Not long ago I picked up an older 6x6 Rollex rollfilm holder for 4x5". The back looked to be hardly used and when I tested it, it had a very positive feel, but when I processed the film, I found it had a very slight frame overlapping problem at one end of the roll. I sent it to Frank Marshman who examined it, and he says he thinks it is not repairable (he didn't charge me, by the way, even though he did take it apart and clean and lubricate it, since he couldn't fix the problem). Unlike a modern back that uses a feeler wheel to detect the linear film travel, the frame spacing is determined on these backs by turning the knob a fixed number of revolutions. Film is thinner than it used to be, so frames will overlap slightly at the beginning of the roll and move farther apart toward the end of the roll.
Has anyone else experienced this and possibly found a solution, or are earlier Rollex backs just obsolete, at least in 6x6?
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