Furnace Motor?

[Charlie]

My furnace blower wouldn't come on so I removed the furnace, took it apart and removed the blower motor. Attached it to a 12 volt source and it wouldn't turn. Took the motor apart and found the armature rough, black and grooved. I cleaned and smoothed it with emory cloth. Put it back together and it worked great. Only problem is the two brushes that contact the part I cleaned are almost worn out, not much left of them. Anyone know where I can find a couple new brushes or a new motor? I already tried Radio Shack. Thanks
Charlie at: netconnected@hotmail.com