I have a older model 70 Varmint in 308 and the extractor broke in half. I ordered 3 new pushfeeds and none of them extract the shell. So I called and Winchester said "that's all we have left". Someone has cut and polished them before I received them in the mail. My question is there any modifications I can make that would allow more grab.Or is there a aftermarket replacement out there that I can install.