For the past fifteen years or so it has become increasingly difficult to find brushes for the five (5) brush powerhouse generator and very expensive when they are located. I therefore have made several sets of brushes for both the 3 and 5 brush "Powerhouse Generators".The procedure is very simple and the same for each type of generator. This procedure works well and I have had no problems with any of the brushes that I have made.
You can easily make a one (1) - 5 brush set or two (2) -3 brush sets in less than an hour for less than $3.
I use the standard 3 brush set for the 29-31 generator that are readily available from any of the Model A parts dealers. I cut then in half using a Dremel Tool with a thin "cut-off wheel", then use fine sand paper to fit the brush to the size of the specific brush holder, drill small hole thru end of brush for wire and countersink back side of hole slightly. I use regular house lamp wire that I strip the insulation off or lamp grounding wire, twist lamp wire so it will fit in drilled hole, put a drop of super-glue on end of lamp wire that goes into brush, to hold brush in place. Push lamp wire thru hole with small amount extending out back side, expand back side of wire into countersunk area and put another drop of super-glue on this area. When the glue is dry, file excess wire so it is flush.Cut wire to necessary length and add a small wire terminal.