Skilsaw Worm Drive circular saw. Backyard DIY saw with very little use for such a professional saw. During startup it'll make a pop sound out the back of the motor (sometimes). It's definitely intermittent, that's why I hesitate taking it to a repair shop. I know automotive diagnosticians hate intermittents. The other problem is the saw just doesn't run as smooth as it used to. I've taken the saw apart to perform tests on the armature and inspect the gear set. Armature checks out fine and...
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