Thanks, photoguy, for the information.
I have the oil, the replacement belt, and took the printer apart.
I attached my shiny new belt and started to put the print-head carriage back on the rail it slides back and forth on.
Then I heard some little do-hickey fall onto the floor. I picked it up and tried to figure out where it came from. Another little object fell on the floor! It used to be part of the first do-hickey that fell.
It seems that a small bushing on the rear of the carriage broke. It is a flimsy piece of plastic that is notorious for breaking, especially when doing this repair. Alas, non of the materials I read or viewed mentioned that. So, for lack of a bushing, the repair effort timeline went down the toilet.
I figure some bean-counter at HP decided that they could save 50¢ by making this thing cheap, rather than using metal or reinforced plastic (which some people with the equipment have done for themselves).
This idiotic little thing is apparently difficult to find. I did find a place in Hong Kong that sells them - $13!!! - but it will take a month to get it. So, I found a place in Florida that has some inventory left over and I am getting two of them. They come in pairs and I now know why. $18 each for this fragile piece of plastic less than 3 inches long.
The best laid plans of mice and men........
I hope I can remember how to put the printer back together.