Low primer alarm installation on the Hornady LNL AP. (If you require the retention kit.)

1.Loosen the aluminum collar screw, and slide it down the primer tube housing. 
2.Set the alarm over the top of the primer tube
3.Install the spring.
4.Adjust the collar distance. You want about 3" of gap between the bottom of the alarm and the collar.
5.Tighten the collar.
6.Fill the primer tube, insert the primer follower rod and you are good to go.