On another note, I know how much of a pain that the umbilical that you have can become with the 60X. The way it is oriented when attached to the head, makes it difficult to have the head bolted down on a flat surface. There is a way, if you do it carefully, to turn the umbilical connector on the head 90 degrees counter-clock wise so that the umbilical does not get in the way when it is on a flat surface. You have to be careful though, the cabling in that head is probably a bit old now, unless it was rewired, and may be a bit brittle.
David