I recently was given a box of darkroom odds and ends. I use a JOBO CPE-2 and series 2500 drums, but in the box was a drum (4541 I believe) that I assumed was a print drum, at least it looked like one. But on the outside it had film and print capacities listed. Can I do sheet film in it? Does it take a special center core, it currently has the little cup that usually is found in the lid of a print drum, does that need to be replaced if processing film?