So I have a Ruger 10/22 that will not expend the fired case 100% of the time, resulting mostly in "stove pipe" jams. It would appear to me that the extractor spring is in need of replacing. The extractor itself looks fine. Casing are ejected out to about 2 feet when firing, when no jams occur. How do I get the extractor assembly out? all I can figure out is needle nose pliers in the small groove on the sides of the bolt itself. Ideas? Thanks!