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Commutators for postwar motors are available from Jeff Kane. It is important to get the slots back in the same place when the new commutator is pressed back on, so mark there location on the stack before you take it apart.  Use solder wick to remove the solder from the hooks where the armature coils are attached to the commutator. Then find the ends of wires and use tweeters to un wrap the wire. Have the replacement commutator on hand before you pull the old one off, as it is likely to break. I use a wheel to pull the old commutators off. Press the new commutator on with the slots in the correct place.  This should be done with a pressing tool that supports the commutator Ofer most of its face.  The felt washer under the commutator probably should be replaced as it is usually soaked with oil and carbon. After the commutator is on, resolder the armature coil leads to the segments.

I would then dress the face of the commutator to ensure it is flat and square. This process is described in the rather lengthy post on “prewar 0-6-0 switches” on this site.

OOF! that commutator looks like a angry squirrel has been at it. You really ought to pick up a fiberglass pencil/brush to clean a surface like that. Just search for 'Fiberglass Brush Pencil' in google, it will come up quick - and they are cheap! Use it to rub the contact surfaces until clean. Much better for cleaning electric contacts than scratching it up with sandpaper


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  • 20221201_123826: Fiberglass pencil.
Last edited by woodsyT

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