I just had my 56 apart yesterday to replace the power lead wire and can say they look pretty common for small electric motors. Mine looked fine but if needed would try my local alternator and starter rebuilder to see what they have. You might find some that just need a little filing to size. (it's a soft metal)
The trick is putting the motor back together as they werent really designed to be serviced. I used a trick learned from rebuilding alternators, and drilled a small hole the size of a regular paper clip through the brush and the back housing with the brush in a retracted position. Then after pushing the brush and spring back into the pocket, I inserted the paperclip through the back to hold the brush back from the armature in place while I put the can back together. Then you can pull out the paperclips and the springs will push the brushes back to the armature.
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