There is a guy near here that is doing beautiful work patching bone handles with super glue. He mixes leather dye to get the color he needs and fills in the hole. He uses a nail to get a rough shape with the jigging to be matched and then the Dremel to finish it and buff it out. You can detect his repairs if you roll the knife and watch the light reflect off of it,but you wouldn't notice it with a quick glance. I am going to go take some pictures and post some of his work.
I think to repair that you would have to fill it and then redrill for the rocker pin. If not the repair would lock the rocker pin.
I have been trying to bend some backsprings in order to restore snap with some luck. If the spring is wallowed out and the blade has a hangnail there isn't much that can be done. If the spring is full, then a slight bend will help, but you have to be careful not to go too far. I just did a knife and made backsprings for it from junk parts. I put a slight bend in the springs and you can't open the knife w/o breaking a fingernail. I am going to take it back part and either file where the kick hits or try and bend it back a tad. If it is a cheap knife the backspring will likely break if you go bending on it.
Best of luck on your efforts.
You can never bet too much money on the winning horse.
"IF YOU CAN'T FIX IT WITH A HAMMER,YOU'VE GOT AN ELECTRICAL PROBLEM"
Men make plans and God laughs