I'm having a heck of a time with this for some reason. Finally got it, but some tricks for making this go easier would be very appreciated. My problem seems to be that the legs on the spring are just a little too short. Push one way and the sear end slips off the sear and the whole spring drops through, push another way and the sear cage end slips off and into the safety pin channel and wedges itself in there. Even with a home made slave pin, it was kind of a bear. The sear wanted to torque and twist, binding on the pin and making it impossible to push in by hand (had to tap in with hammer, which I would prefer not to do for fear of scratching the pin or enlarging the holes).