Thank you! That makes sense. I'll have to take it apart again to see whether the brush but spins, but I've a feeling that that's what's causing it.
I've been using Hoover parts, yes!
My Hoover vacuum cleaner keeps snapping belts. I've replaced a few, but literally as soon as I turn it on, with a few seconds it snaps.
I've had a look, and I think the issue is that the roller won't turn (it should turn fairly easily, right?). I've attached a couple of photos... One shows the...