A few years ago my dad gave me a Unicolor print drum he said he processed 4x5 negs in. He said you put the chemicals in it and slosh it around in the tub. I tried it and it filled with water. He said without the water dummy so I tried it and came up with the worst processed negs in the world. I got streaks of uneven development. What I want to know is if anyone has had any luck with this and if so how. He said there was never a rotary base with his. And can I use it for 5x7 negs? How necessary is the base?