I cut the selector lever where it goes through the reciver and weld a piece of socket, the same size as the selector lever to extend it. Because I use outer shells screwed on to the sides of the 3/16 receiver shell, they also retain the FCG pins in place so no clips or hooks are needed to tetain them I drill the pin holes the same size on both sides and cut a piece of ak cleaning rod to fit them flush. Then I harden them before installing them. The ak cleaning rod is exactly the same diameter as the hammer and trigger pins. I beleive the rods are heat treated anyway, but I am not sure so I do it again to be on the safe side. By the time my receivers are complete I think they should rival the strengt of a milled receiver or better.