I found an easy trick: cut two pieces of string, about 6 inches long, and run them over the brushes (you have to loop the string under the copper wire). Then tie the ends together. Next, you pull on each string loop, so that you can hold the brushes in place, and slip the back cover on. That'll get the brushes over the rotor. Then cut the string loop, pull it out, and push the cover all the way in. Screw it into place.
Voila!
Now I have a nice pump, with the filter caps and the diode inside of it, and a bigger cap sticking out the back, with leads running through a couple of holes drilled in that back cover.
I'd have pics, but I had to start a new roll, so I'll only have the shots of the test run, until I finish that film.
