After I wrote the post above I figured it out. Pretty easy actually.
Undoing the right knob will unlock the column so you can raise it with the left knob.
You need to raise/lower it until you get a focused image on your easel. What I generally do is to raise it (yes, it's heavy but not too much and it should go smooth anyway) until the height indicator reads the easel height, approximately. Then, with a focus finder and a negative in the holder, I fine-focus on the grain. Then you need to lock the column and the enlarger will keep the focus no matter where the head is. That's the "auto-focus" mechanism.
In some cases though, when the column is at the highest position or in the lowest position, focus gets lost. There is a procedure to recalibrate the autofocus mechanism but it involves opening the head and tinker with the camshafts. The easiest way to work this around is to act on the lens holder, rotating it until you get the right focus.
Last edited by LikeAPolaroid; 08-10-2012 at 05:59 AM. Click to view previous post history.