The downstairs Dyson 'hoover' stopped picking up...
This, of course, is when needed to get a spill of wood-based cat-litter's saw-dust out of carpet...
( We have Murphy-certified 'Poltercats': If can go wrong, they probably pushed it over the edge... )
So, watched by the cats, empty the Dyson catch-pot. Re-assemble. No, didn't help.
Check for blockages. Re-assemble. No, didn't help.
Poke out potential blockages from less accessible recesses. Re-assemble. No, didn't help.
Check flow diverter working. Re-assemble. No, didn't help.
Invert and smite body of beast, AKA 'Percussive Maintenance'. Re-assemble. No, didn't help.
Repeat all the above twice. No, didn't help.
Re-assemble in disgust, en-route to 'Plan_B', deploying 'wet & dry' R2D2-ish machine used for power-tool dust / shreds extraction.
Lo, the Dyson now works again !!!
It cleared the mess I'd made 'cleaning' it, disposed of the cat litter's dust in seconds...
So, WTF was different third time around ??
D'uh...
For my next side-quest, I'll investigate why upstairs Dyson 'hoover', a much older model, also stopped picking up.
Given the motor spins furiously, I suspect drive belt...