Step 1: Gather Supplies
I had purchased a regular fiber optic cable (used for home entertainment systems) to use for a different project. I decided to use this as a "proof of concept".
Small drill bit (physical size of sight will limit this) - I used a bit that was ~1mm
Pin Drill vise
Step 2: Drilling
The front sight originally has a small divot on the rear face (towards the back of the gun) that is painted white. I started by drilling a small indentation as close to the center of that divot. This indentation will keep the drill bit from wandering.
If you look at the profile of the sight, the rear face is not exactly perpendicular to the top of the sight. Therefore, if we were to drill a hole perpendicular to the rear face, the hole would go through the top of the slide, not through the front of the sight. THAT WOULD BE BAD!!! I needed to angle my bit so the hole stays parallel with the top of the sight and exited through the front face of the sight.
***NOTE: depending on what kind of pin drill you're using, you may want to partially wrap it in masking tape to keep it from scuffing the slide. I failed to do this and now have some small scuffs on the top of the slide (see last two photos).
Step 3: Fitting the Optic
The photos show this audio cable installed. It was very difficult to get a good photo of this. The performance of the optic was only so-so.
Step 4: Letting the Light In...
First, I had to cut one of the flared ends off of the optic to remove it. Then I used a combination of multiple shallow cuts with a hacksaw and finished off with a flat file. I cut just to the bottom of the drilled hole, although I'm thinking I may eventually cut/file the notch a little bit deeper so the optic is completely suspended and light can enter from any point around the circumference.
At this point, the performance was a little better, but still not quite satisfactory. I think the problem is due to the audio cable optic being CLEAR. This optic will transmit any color that is in front of it. If you put something red in front of it, it shows red, if you put your hand in front of it, it shows flesh color, but worst of all black.....you guessed it, shows black. The optic basically disappears. I had to get a different optic, so back to the ol' interwebs I went.
Step 5: Fluorescent Fiber
Installation is the same as before. Cut what you need, insert into the sight and singe the ends with a lighter.
The second photo shows the fiber glowing very brightly. This is because I hadn't cut a small section off of the 3' long strand. I had just inserted one end into the sight to get an idea of what it'd look like. I was pretty disappointed when I cut the excess off because it no longer glowed like that. I was kind of bummed out actually and started to look at other options. I decided that it was good enough for the time being, as it was still brighter than the white paint.
A couple days later, I went to the range and was surprised at how well the sight worked. The natural sunlight (even being in the shade) lit up the sight much better than the CFL lighting in my house. This is still not even in the realms of night sights, but it definitely helps. I did find a site that sells individual Tritium vials for ~$8 each. They come in 1.5 mm diameter x 6 mm long. I think there is enough material left in this sight to drill the hole .5 mm larger, but for now I'm going to use this for a while.