just replace the fiber optics.go to fiberoptics.com and you can purchase the size and color you need.i have don that on several pin sights and they are alot brighter. i love the green for hunting.
its fun and interesting to do and fairly simple and alot cheaper. take the old fiber optic out --stick one end of fiber into sight pin making sure it is all the wayin to the bottom of the pin--cut it just a tad longer at the tip and take a lighter and apply it near the end of the fiber not touching the fiber optic itself and the heat will ball the end of the fiber to the tip--it may take a few trys but it will come pretty easy after you get the hang of it. i did it on all my extreme sights and they work great. its not hard at all but worth the effort. after a period of time all fiber optic gets build up on them and makes them seem rather dull than before. the spot hog is a excellent sight and worth a try.