The horizontal hole is the trigger stop the diagonal one is to attach the trigger to the trigger rod. The trigger rod is what actually pushes the valve pin.Is your trigger rod in there? If you go to the nova tech page at the link it has a pretty good description on how the trigger assy. works.
I checked mine and found one with a trigger that has a trigger stop like you describe. If you look at the screw hole in the front of your trigger is there one screw going straight back and one screw going diagonal ? You'll have to screw the horizontal one in past the hole to see the diagonal one.
There were a lot of variations in the novas/ supernovas.
Last edited by bsm; 02-13-2012 at 07:00 AM.