Needs new brushes as one had cracked along half the length but not broke
away, so forming a wedge in the slideway. Along with some conglomeration of
carbon etc in that part of the slideway and beyond into the gap and
presumably into the crack , until it jammed out of contact. Anything to be
aware of for the brush composition ? otherwise looks like a mains voltage
carbon/graphite brush. No name motor for spares. How to clean off the build
up of carbon on the commutator and is there an equivalent , for low V high
A motors, of bedding in with bedding stone ? as no aperature available to
poke any stone in there when assembled.