Reddit reviews Loctite 242 Threadlocker - Blue Liquid 1.69oz Bottle

I think blue loctite is what you want.

https://www.amazon.com/Loctite-242-Threadlocker-Liquid-1-69oz/dp/B002P8LQ1C/ref=sr_1_9?crid=1XJMWRPY3D18Z&keywords=blue+locktite+thread-locker&qid=1563036528&s=gateway&sprefix=blue+lock%2Caps%2C194&sr=8-9

Here's my setup. I just removed the screw in the top, center of the visor, flipped it around, and replaced the nut with one of these. Then I used some Locktite (there are different strengths, you can get stronger than this one if you never plan on taking off the mount) to make sure it stays on.

Here are the steps to take off the visor:

1. Remove the padding in the helmet.
   
2. Remove the e-clips inside the helmet by your ears.The rods and padding that holds the visor will fall out, put those in a cup or something.
   
3. Gently pull the mouth of the visor away from the helmet. Now you can access the nut holding the top, center screw on. Use a socket driver or adjustable wrench and a phillips screwdriver to take that screw out.
   
4. Now the visor is off and you should be ready to install the mount.
   
   When you're done and have the visor reattached, gently slide the visor up and down on its rail. Mine got shifted and scratched the carbon fiber right next to the rail, so be gentle on your first go to make sure everything is properly aligned and won't damage the glossy finish.
   
   Feel free to PM me with questions.