I've just put together 160 chain master links. That much practice makes you real good.
My favorite tool turned out to be a dentist pick for installing the spring clip.
1.slide spring clip into place on one end.
- put pick on inside of clip opposite end. Lift and rotate clip over other pin on master link.
- push down with thumb on back side of clip opposite dentist pick.
- use pick to push other side of clip into place.
Goes faster than it took to write this. Or, least after you've done a 100 or so for practice.
Karl "very sore fingers" Townsend