Originally Posted by Stretch

Unless I am mistaken this wiggling of the steel tubes is done when you remove the flex disc not when you do it up.

The problem (as far as I am aware) is that the ends of the metal tubes stick in the yoke on the gearbox. If you just lever them off you could just rip them out of the flex disc because they are kind of floating in there (for this type of flex disc - not applicable for the solid ones).