I got a HP combiplan 4x5 tank to develop my first negatives in, and I'm pretty happy with it so far, but I've noticed a few times that the negatives slide out of the slots and stick together, causing uneven development. They load in just fine, but I'm guessing the agitation is what moves them around. Looking at the rack, it seems the side with the screws is perfectly tight, but the other side of the holder moves around a bit, causing the negatives to slide out. Any suggestions? I was thinking of shimming it with something, or just gluing it together, but I'm not sure.