I was working on the band organ on the local carousel and noticed
a problem with the lighting (the lights were going off and on).

There are four fingers supplying electricity through four slip rings.
I suspect the fingers are brushes, similar to motor brushes.  One
finger is missing altogether and a second one is missing it's brush.
Can someone confirm this?  Does anyone know if they are special or
just common brush material and where I might find them?

Dave Clark