Well, once mounted ...

Like many other people, I struggled to mount ... Plastic parts are badly molded and fit poorly in aluminum tubes.
Result or by forcing it to pass and 2 once it wrong the aluminum tube or must tinker a bit.
For my part, I first try to get the aluminum tube by heating the torch for deformed plastic, but too bad for castings it was not enough I had to take them to the dremel. .. In short, non-yourselfer abstain.
For others, once mounted, it is super convenient and very stable.
Delivered assembled, it would be a 5 star for me!