You know ve got an extra pin for my Cobra ascent sight which I want to experiment with. Im sick of just 3 colored pins and was thinking about trying to find some of the material for the optics in different colors and changing the pins color. Just to see if something could be more visible. For me green is great but yellow is kinda blurry and red well, It sucks. Any ideas on the diameter Id need and where I could find some fiber optic rods that would be small enough to work. My pins have the smallest diameter available from Cobra.