Hi, everyone. I have a Durst Laborator 1200 that a picked up a while ago - and have been trying to make sense of a few of its features lately. Can anyone tell me what the two red knobs are on either side of the unit? and on the other side: My understanding from the manual is that at least one is a opening lever so you can move the negative around while it is in the negative carrier. I have the Duest Femoneg - and those two red knobs don't seem to affect anything to do with that carrier. Thanks for any information.