I followed the photos posted by Vacuum Cleaner House to disassemble my DC23 turbine head.
(Thanks for those excellent photos! Very helpful.)
I had plenty of hair and compressed dust, but nothing obviously broken.
After thorough cleaning, it seems like my brush axle is not turning freely enough for my turbiine head to spin up on carpet.
With the brushes removed I rotate the metal axles, and there is plenty of friction.
How to know if it is too much friction, or if it is normal?
When a turbine is in good repair, how much friction is in those axles?
If I spin it quickly, should it continue spinning for a moment?