Armasight scope mounting system for clip-on - Armasight Scope Mounting System for Clip-On Day/Night System

I bought this product 7 months ago (despite the bad reviews), together with the Armasight CO-X HDI, and I couldn´t be happier. I go out hunting almost every week, and I haven´t had any problems so far. I use it to join the CO-X with my Swarovski 56mm scope, and it adjust perfectly. Using a rubber ring first (which comes with it), in order not to scratch the scope, I can mount it in 30 seconds in no light conditions. The only thing I didn´t understand at the begining was that you have to remove the little metal ring from it, otherwise it won´t fit in the clip-on (you can see the little ring in the picture. It has a little screw on one side. First, I tried to unscrew it, but then I realised I had to rotate it out. My fault).