I've taken to using an 8x10 Unicolor drum for my 8x10 negs because the Ilford drum I started with that had the nice internal cup for holding the chems until process was started bit one of my negs when the lid popped off unevenly on removal, put a huge gouge in the emulsion as big as the end of my finger. What I don't know is what the minimum amount of solution is on these and does the internal ribbing cause problems with uneven agitation and flowmarks. We settled on 6 oz. being a good bet and used that with no problems. Who can tell me whats what on this? Is there a best drum for doing negs on a roller base?