Mrs ERJ called up from the basement, "Joe, the drier is not working."
|Picture from HERE|
Incidentally, the spring steel base for the idler is not held in place with a screw. It has three tangs that clip into slots and the belt tension holds it in place.
The belt was available at Lowe's for about $8. The parts are installed, the drum turns but is making noises.
Fortunately I can order an idler-wheel assembly on-line. I am getting pretty practiced at disassembling and reassembling my drier. (That is code for, I did not put it back together again correctly the first time (or two)