On my dyson upright, one of the balls won't turn, and it's the one you can't remove
To remove the ball shell on that side you will need to turn the small round center cap counter clockwise. I usually stick two small Torx screwdrivers into two of the holes to give some leverage to turn the cap. Stick a flathead screwdriver in one of the slots of the nut holding the ball shell on to twist to remove the nut. Try to determine what is causing the resistance to the ball shell moving freely.
on Dec 27, 2017
My dyson v8 vacuum fell from the charging station, now it does not run?
There could be a lot of things that are causing this. I don't see where the battery is removable. It is a lithium ion battery and it may be suffering from broken connections or broken regulator. It could also be that the wire connections to the switch or the motor came loose. The brushes in the motor might be damaged. You may have to send it back for service. It would not be covered by warranty due to physical damage.
on Dec 22, 2017
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