Dremel doesn't power on: brushes?

Question

I have a mid-2000s Dremel 400XPR that I've used over the years for a variety of projects. A couple days ago I tried to use it and found that it doesn't power on. I read through the manual, tried a few different (working) outlets but still nothing.

Is it worth replacing the carbon brushes or is that unlikely to fix it?

Photos at: https://imgur.com/a/qpqKOj4

DrMoishe Pippik · Answer

My experience is that the brushes sometimes become stuck in their channels so that they no longer contact the commutator.

Remove the brushes (if the spring pops off, pull gently with tweezers). 
Clean the channel with a cotton swab. 
Put a single drop of lubricant on the brushes.
Reinsert, keeping the curve of the brush so it conforms to the curve of the armature.

That often fixes the issue until the brushes are worn down.

Dremel doesn't power on: brushes?

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