I just received an ED66 CF from Orion (their CF equivalent of the discontinued AT66 ED, I believe). While the focuser is buttery smooth, it is quite stiff. The instructions say that the tension can be adjusted with the "drawtube tension thumbscrew," however, this is already loosened all the way. I called Orion and the rep wasn't quite sure. (He seemed more willing to let me figure it out, and exchange the whole thing if I couldn't get it, which I thought was a bit silly.)
I've never messed with a focuser before, so before I start playing with allen keys, can someone advise me on what all these screws do? I labeled them to make it easier than saying the "larger silver one" etc.