This is the way I do it. The late Russ Ruppel showed this to me and explained on how to do it.


If you go to the L.C. Smith site, on left go to Photo Trail, opens to the right, go to the third one down. Will give you the instructions you need.
The workers at Hunters Arms used something like a 3/32" nail set into the hole of the top lever shaft(4-40) and then used an old screwdriver wilth a "V" notch to push the nail set over to align the shaft into the hole to let you shart the 4-40 screw.
If the top lever is sticking up some, you will have to tap it down so that the top lever shaft goes into the fit in the trigger housing plate.
That is the hardest thing to do, also don't forget the safety slide.