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I would think it is the same problem still, probably a bit of carbon is still shorting between the commutator segments, try cleaning out the slots again and make sure you get all the way to the start of the slot. Fingers crossed.

If you have run it shorting too much then the smoke may be terminal breakdown of the coil wires.

Can you check resistance with a meter - there are three segments so you get three different resistance readings but they should all be close +/- 10%. Any big difference is indication of either the commutator segments shorting or the coil wires shorting.
 
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