Bosal AK4 Tow-Bar Problems.

Just bought a used Honda CRV towbar from and ebay seller.
The description said, and I quote, "The item is in excellent used condition, you would hardly think it has been used, it is in complete working order and comes with two keys for swan neck, storage bag, gloves for use, owners manual and blanking cap for when the swan neck isn't fitted."
I drove to the sellers address in Coventry to have the tow bar fitted at an additional cost.
All seemed to go well.
After I got home I tried to fit the tow ball but couldn'tas I couldn't turn the mechanism as detailed in the user manual.
This video is for the seller and anyone else on my forum and youtube who is interested.
The video clearly shows that this towball is completely knackered and is certainly not as described.......