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I used blue threadlocker for the bolts. What I meant by 8mm bolt is that bolt has 8mm hex head with 6mm shank width. I have lots of these leftover from waterpump hardware. I don't have the hand tool for rivets so I didn't use rivets.
For headlamp adjustment:

You have to turn the adjusting knobs many times (maybe up to 10x) in one direction while watching the pattern on the wall. Then you'll know which turns (clockwise/anticlockwise) produce the up or down aim.
I also compare the height of my headlamp aim with adjacent cars during traffic stop at red light (night time). Then re-adjust accordingly back at home.
Amarin
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