Just thought I'd relate this, as I was surprised the spares were available.
The air-operated turbo brush on the Henry works tolerably well. Mainly, elder son uses it - he rarely fixes or even notices much!
I came to use it a few days ago and the brush roller was jammed solid. I had to dismantle it completely to get the wrapped round hairs, muck etc. out.
Even the, the brush didn't spin freely. It has metal pins either end that seat into holes in soft plastic bearings (polypropylene or similar). Neither moved well. One was OK once cleaned out, but on inspection it looked as if the other had overheated to the point where hairs, etc. had melted into the plastic. It would *not* spin freely.
To my amazement, new bearings are available at £1.39 plus postage. It now works well again!