I installed the Timney myself after the original trigger broke a piece inside.It was very simple,push out 2 pins,push in 2 pins.I shot it for about a year,and never adjusted it from factory setting. I was way back in the Adriondac Mts. when it failed during early MZ season. I went to pop a cap prior to loading,and it went off. The trigger will adj enough to engage the sear,but then it will not release.

Charlie