Pick up the color fiber optic from your pro shop. If your pin is not the wrap around kind and has two holes where the fiber optic fits....put the fiber optic in the hole closest to the mount and have it stick out just a little. Take a screwdriver (or something) and heat the tip and touch the end of the fiber optic where it sticks out of the pin, it will flatten it out a little so it won't come back thru the hole. Next take the other end of the fiber optic and put it thru the other hole. Pull it tight (not too much pressure), cut so there is just a little sticking out and touch it with the hot screwdriver tip. You're ready to go. Just remember the more that sticks out your hole the larger you "dot" will be. Make sure you buy the correct fiber optic size.