I bought a Dyson DC14 for 5 dollars from a garage sale, the seller said the brush no longer rotated. Turns out the clutch switch was too tight due to a missing
Dyson DC14 roller bearings and block/ bypass relief valve – Fix It Workshop
Amazon.com - HQRP 2-Pack Post-Motor Filter Pad compatible with Dyson DC14 DC07 series Vacuum Cleaners, part 918980-01 Replacement