Cut the tip of the old one off and push it out of the sight housing. Then take the whole replacement and shove it in the housing it is way too long but that is alright. Make sure about 1.5 mm sticks out of the front of the housing. The take a razor and cut the other end with about 1.5mm also extra sticking out of the housing. Take a lighter and melt the extra on one end till it makes a bead, then melt the other side till it makes a bead. There you go, melt don't burn. Copy the bead size that came from the factory. The fiber is held in like a rivet......just two deformed heads holding it in place.
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