I just started restoring a Lionel #8 and would like to replace the brushes. I didn’t realize until I took it apart that the commutator was inline with the shaft and the brush face is curved versus being flat and perpendicular to the shaft. I wanted to know how do you shape the brush so it’s concave shape? Do they make them pre-shaped? Do you use them flat and run them in? Do you file them? What is the correct brush? I see 2-17 on Hennings and brush 75 on Olsens parts diagrams. Thanks in advance for your help.
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