How do I get the new recoil buffer in? I took the lower off to send to Bill Springfield, and I found that the nipple had broken off the recoil buffer. Bill did a great job, and Terra sent me a new buffer( thumbs up to both of them!) I came home from vacation to find all the parts ready for reassembly, but I cant figure out how to get the new buffer in. Pushing on it just makes the nipple bend one way or the other, and I'm afraid I'll break the new one if I keep trying. I tried getting the blade of a screw driver in there to work the edges in, but I think there must be a trick-way too much frustration and potential for damage and injury the way I'm trying. Anyone (maybe RA staff) have a tip on how to get it done?