I just bought a proper enlarger for my 4x5 negatives! It is a Beseler 45MXT with the Dichro 45S color head. Everything is in pretty good shape. The one issue I'm noticing is that the cyan knob will slip out of zero when I adjust magenta. I'm thinking it needs some cleaning and lubrication perhaps? Before I dive in to take this apart, I figured I would make my first post here and ask if anyone has any advice! Thanks!