True fiber optic material is composed of a core layer of material that is impregnated with a fluorescing compound that reacts to light, surrounded by a thin sheathing layer that has a different index of refraction. Ultraviolet light enters through the sides of the fiber and is trapped within the fiber because it cannot reflect back out through the sheath because of the difference in refractive indexes between the core and the sheath. The UV light causes the material in the core to fluoresce and emit visible light out the end of the tube. The longer the tube the more light is captured and emitted out the end. Check out the Lightning Rod fiber optic sight. It is the brightest you will see, because it is longer and it uses true fiber optic material.
One benefit of the physics of the fiber optic is that on a cloudy day you still have lots of UV light available to light up the fiber.
1) Remove the broken fiber from the sight.
2) Insert replacement fiber from the muzzle end and leave approx. 1/16 inch sticking out (the more you leave sticking out the bigger the dot).
3) Melt the end with a cigarette lighter.
4) Hold the melted end tight against the sight and cut the end closest to the muzzle, leaving 1/16 overhang..
5) Melt the muzzle end of the fiber while holding the fiber tightly against the sight.
It is important to make sure that the fiber is snug in the sight with no play back and forth. A loose fiber will break very quickly.
Replacement fibers are available in red, yellow, or green.
Please feel free to call if you have questions regarding the installation or use of this product