It works, it is the main! 1

I could undo and put some links on 2 mountain chains without any particular difficulty. I had not previously of experience of this type of tools, difficult to compare with others, but I could do what I wanted, that's the main thing.
The axis is not necessarily very well aligned, but it did not bother. That pretty solid in air, and at least for occasional use, it must be ample (especially for that price!).
The tip to avoid mistakes beginners like me: do not push the metal rod of the chain to the end. If it comes out, it is impossible to recover!