I've gotten hooked on rotary processing lately and I began with single sheets of 8x10, no problems there. I'm using a beseler base as well. When doing 2-4 sheets of 4x5 film, one sheet often slips out of it's spot and lands on another, scratching it to hell. It seems that there's too much space for the film and they get loose even if I gently pour out chemicals. Anyone got a solution for this? Besides jobo drums.