gem. Corsair/elgato 2kg https://help.elgato.com/hc/en-us/articles/360034788872-Elgato-Multi-Mount-General-Info-and-Quick-Start-Guide

Hi, I'm not using it for a ring light myself, however so long as what it connects to is strong then there would be no problems. The whole Elgato mounting system is both solid and easy to adjust. Placing a Elgato Key Light on the L mount is no problem so the ring light should be ok.

English, France?

Yes. The clamp is connected to the pole with screws. I had to unscrew them and screw back with the base. The screwing tool is provided. It's super easy.

The best thing to do is to contact our customer service directly at https://helpcenter.galaxus.ch/hc/de/requests/new. Your request can then be examined individually.

Yes, that should not be a problem. I have a Logitech Brio attached.

Is in stock at various branches.

Unfortunately, we currently have no information on when the item will be available and when we will be able to deliver it. As soon as something changes in this regard, we will post it here. Sorry.

In this case, please contact our customer service directly so that your order can be checked. https://www.galaxus.ch/de/Information/ContactInformation