I've had a fan blow before! I'd glued it up once years before, and it broke again so I had it back for another bodge. I was filming it actually, and was demonstrating how much faster it spins if you block up the suction hole to the head and it ramped up to full speed and shattered. Stopped filming and told her unfortunately it was too far gone so she bought a new head!
Wow! I was preparing to do record a video in a few weeks time showing the turbo tool, how it works etc, how it performs on different machines and so on. I guess that shall have to wait now!
It was the tool you commented on, on my instagram when I asked about the bearings and you said about them being them brass sleve things.
Somehow I get the impression that them being damaged caused the blow up, I was just about to click buy it now on some new bearings, brass sleve? whatever it is that I found matching on ebay from the part number on them.