No evidence of over twisting when look at rubber covers.
The outer felt "notchy". I took the circlip off the drive shaft and slid the shaft out.
The inner and out cage and all the balls dropped out.
No broken bits or obvious signs of damage.
Placed the the balls back in from the outside (is it all meant to come apart)
Put it all back in the main housing, one ball rolled off.
It is all in place now, but with only 5 balls and jammed rock solid.
Cant get it apart now!