As happened with my first Clarity, the driver's side sun visor on my second Clarity was starting to droop. My prior repair attempt (on the first Clarity) didn't turn out very well -- I snagged and tore the cloth cover while drilling, so I decided to try a different approach this time. First, I pulled the cloth liner away from the mirror, and then moved it out of the way.
This also created enough slack to allow me to slide a temporary spacer (a large nut) onto the opposite side of the visor to keep the cloth away from the drill bit. I gradually stepped-up the drill bit size to allow better control, and to make smaller plastic chips which were easier to remove from both sides of the visor.
It turns out that a 1/2" threaded post is the perfect size to tighten the visor's internal spring clamp. Getting the female side of the post pushed through the covered side of the visor was tricky. I used the eraser-end of a pencil to created space and to help guide the post into the hole on the backside.
This repair turned out much better compared to my prior attempt. The visor is tight again, and you can't see either end of the threaded post hidden inside the cloth cover.