Never mind, I figured it out. I had to straighten the Spring in order to have it touched the bottom of the cap and now it works. Thank you for your video it helped me to understand what the brush is for

The brushes apply electricity to the commutator (the shaft that spins inside) creating an electromagnet that is always trying to reorient itself to the magnet around it (the metal around the spinning shaft) and therefore making it spin. The springs pushes the brushes to the spinning shaft for contact, but because of the friction, the brushes will get shorter with time until the spring is not pushing with enough force, and that's when the tool stops working. So, using your rotary tool at full speeds and/or reversing the rotation without stopping do waste more the brushes.

QUESTION! when I tighten the brushes down it make it harder to spin the tip, and won't spin at low speeds. Should I not tighten them all the way?

I have a problem, I have a problem I have bought a brand new hypertough Rotary tool. And no it won't start. I was going through the owners manual and I saw about brush replacement, and I was perplexed because my cordless dremmel 8220 does not have the brush. The 8220 being, my very first of these tools, I didn't even know what it was. As I was watching this video, I realized I realized that this must be what my rioby tools mean when they say brushless. So I used the little wrench that they sent with it to open that cap up and after I put it back in, which I did struggle to do.

Thank you so much for sharing this video. Very informative. 👍🏼

I cant find the replacement for hypertough one.. can u tell me which ones do u buy?

Thanks for the video Karl.

There aren’t envy on my Drexel just 2 black dots can yo tell me why

Can you upgrade the speed that your motor brush puts out in the cord Dremel

Anybody knows if dremel carbon brush 90930-05 is compatible to dremel 200 and 3000 ?

I checked my brush before this video and i had the bad type w/wire in my dremel type 5 model 300 something and the wire was roled up and the graphite part was 30%used

Love the videos, but the audio is so low i have to crank my volume way up to hear you. maybe a boom mic or lavaliere?

how do you get the bendy ones back in?

Hi quick question. My Dremel stopped working. Is there a way to pinpoint if the problem is with the brushes or something else?

Is it any specific size or dimension for this brush

how do you know when you have to change the brushes? thanks for the video!

Where I buy these brushes in india

I am trying to replace in a Hyper Tough one and you completely skipped over it. This was absolutely no help.

You never showed or mentioned the symptoms which would cause the brushes to need to be replaced, not did you then show how to replace one!?! This video was 9 minutes of, “Here are four tools, which I bought at various stores, and some I like better than others. Sometimes your tools break. This is a brush. It can break. I’m not really sure what it does, but here’s where you locate it. It might be your problem, it might not be, but it doesn’t matter because I’m not going to show you whether it is broken, or HOW TO change it anyways. Maybe you could look in the instruction manual, because it could be the problem, whatever problem that may be, and maybe you can buy a new one. Or maybe not! Like and Subscribe!!!” Thanks, Bud!!!!

NOW I'm no expert either - - but - I think those have to do with the internal Grounding of the circuits. .... :-) ... .. Because those caps aint goin' nowhere but Plastic. Yeah? Non-conductive. They are probably needed FOR the circuits of the motor so that it "keeps flipping" , yeah ?