There is no movement or space for movement. It's full inside of white plastic and 2 rock hard rubber rings, suppose there will be some give in it with the right force.
Anyways, mine is in. Guys before you start make sure the non adjustable end fits into the bracket and the nut goes through. I had to pack up half way through fitting to go and grind the bracket down slightly.
And get a m10 nut and bolt to replace the supplied one that connects the bracket to the non adjustable end. The supplied ones baffled me, the nuts a non metric size so I didn't have any spanners to fit it properly and the bolt need the a Allen style head that was far bigger than any thing I had.