So I recently picked up a sliding compund miter saw for next to nothing at an auction. Spun up but sounded a little rough, but figured I could get it home and at worst it might need some new bearings and brushes. As it turns out after I took it apart I found that the teeth on the armature gear had been worn significantly in the middle (see picture). This causes then to only make slight contact with the arbor drive gear. The reason it was sounding rough is the the gears were slipping/grinding significantly when it runs. I can replace the armature assembly for about $50, but my question is: Is there something I should look for that caused this to happen in the first place? In other words, if I replace the armature, am I going to be back in the same situation a year from now? Everything else looks like it's in good shape, and the arbor bearing/gear spin freely on their own.
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