Yamaha XMAX - Quad Lock vibration dampener mount - how?

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Inspired by Francesco Ponticelli's video: • How to create a Quad L...
I found a solution to fit the Quad Lock mount on a Yamaha XMAX in the middle, on the upper cover of the handlebar in a central location WITH the vibration dampener. The dampener does not sit well on the cover and the integrated screw is not long enough, that is why I decided to include an additional part from Quad Lock. My mirror mount does not fit under the cover but I did not want to disassemble it, so I used a screw nut instead.
If you already have a Quad Lock setup it is relatively easy and cheap to install it.

[@user-px2zr9ot8k]

Can you tell me the diameter of the hole?? I would also like to know what do I buy from quad lock??

[@danielljs6519]

What I used: mirror mount, knuckle adaptor and a vibration dampener.
I think the ball adaptor could be also used instead of the mirror mount, it is 10 EUR cheaper, but the mirror mount can also be used on the mirror, so I think that is a safer option. The hole's diameter is 6 mm.