Great little video showing a common fault of pulsing on some models of Dyson vacuum cleaner.
Not recommending any use of partner’s toothbrush 
or you may be fixing more than just the vacuum cleaner!
Ha, this is useful! There’s a vacuum workshop coming up this weekend at the Crieff RepairFest 2026 event, I think. I’ll pass this on to Iain (and remind him he’s got an invite waiting to be used 
)