The green one looks much brighter, but I’m used to the red, so I went with it. Insert the rod all the way into the “crimped” portion of the SDM sight :
Trim it off with a sharp knife, make sure the cut is straight. A suggested way to cut it is with a sharp nail clipper.
Then use a lighter to melt the tip. The amount of fiber sticking out determines how large the melted portion will be.
After that, for good measure, I put a very small dab of Loctite at the end of the fiber and behind the melted portion to make sure the fiber stays on the sight.
There, back to normal. Sweet! I got my baby back.