Firstly, Thank you vshore for giving me permission to add this.
I think vshore's method is a pretty decent way to mount the visor, so here you go 405TH.
vshore100's Mini tut:
First off, I started by taking rubber bands and looping them through the holes to keep the visor in a constant bend. It makes it easier when you are trying to hold the visor in place for marking. You don't have to have constant pressure on it. Just enough to hold it in place.
Next, I covered the visor in stretch wrap. This not only helps keep it from getting scratched, but also give you something to mark on with out actually tracing on the visor itself. Also, my visor didn't come 100% covered when I bought it, but yours may be different.
I then slid the visor in place, and proceeded to trace around the visor opening to get an out line of where I need to cut.
After that, I outlined the previous marking so as to have a perimeter to mount the visor to and this will serve as my cut line.
Next, I used my dremel and cut out the visor portion I would be using.
Next... time to choose the mounting hardware and something to glue it all in. In Black's tut. he used chicago screws and mighty putty to mount the visor. This is where I went a different route. At work we use what is known as a 1/4-20 poly nut, or nutsert to fasten some of our parts together. They are used when you don't have access to get a traditional hex nut in a particular location.
You can see in the pic that they are crushed (nutsert on the left) using a tool similar to a rivet gun. I used this to my advantage as I could size them anywhere from 15mm down to 10mm. Which helped me make up for any thickness differences in the rondo.
The adhesive I used, also readily available, was JB kwik weld. It sets up in about 4 minutes and holds strong.
So I first found where I wanted to mount the nutserts. Each one I traced with a sharpie marker, adjusting the heights of each one until I had what I needed. Then, I mixed up a small batch of JB weld, a placed a little on each of the three spots and stuck the nutserts into place, then let it set for a few minutes. Then, I made another batch and applied it around the base of the nutsert to really lock in place.
Once the weld had cured, it was time to mark the holes in the visor for drilling. I started with the top one, centering the visor where it needed to be, marked the first hole, drilled it out, and screwed in it. Then, I marked the two remaining holes, drilled them out, and screwed them in. I did have to cut my screws down to about half the original length because I collapsed the nutserts. You can see the 1/4-20 button head screws I used in the photo, but you could use the hardware of your preference.
And here is what it looks like FINALLY mounted with the covering removed...