First let me say I love my 15/22. Everyone from grown men to young girls (I have daughters) love to shoot it. It gets lots of love at my place. Problem is.. last week when showing my buddy how to break it down quickly the rear takedown pin pulled all the way out. No problem I thought. Now I see that there is supposed to be a small spring and a ball or detent of some sort to stop full removal of that rear pin. What now? I have finally found a schematic for the gun but it doesn't even show what I am talking about. Thanks in advance and God Bless America!