On my Busch Pressman C I find the film holders fit easily in the back, but the Grafmatic film holder, "23" Graphic, holders fit really tight and stretch the springs to the extreme. I thought about this and backed the two screws in the center of the springs, one on each, out about an 1/8" and the Grafmatic holders fit easily. The film holders fit easily too. They are still tight and the GG seats firmly unloaded. I am thinking of replacing the two wood screws with two socket head screws with knurled heads for an adjustable back tensioner. Any thoughts? I thought I was out of luck before this simple adjustment.