I bought my 4550XLG on eBay a year ago from someone going the "d" word. It has been wonderful. I'm using it for b&w 6x7cm roll film and 4x5 sheets. I hadn't said anything Ron because I don't know of a download source for documentation. If you need any help when you receive the unit just ask, but set up is quite easy and well described in the manual.
Jeffrey, Thanks. I had not seen a focusing wand in any of the dealer accessory listings. When I am head down on the easel with my eye in the Peak grain focuser the focusing knob can be a long reach.
Having read about such tools on other enlargers I fabricated a substitute out of a length of soft 3/16 clothes line. I ran the head up to the top of the post and simply cut a piece of line long enough to use at the extreme. The focusing knob becomes a pulley with both ends of the line going to my hands. If you keep a little tension on it the line stays on the knob.
Good Luck and ask for help if you need it.
John Powers
Bath, OH