Hatsan springer Mod25 Supercharger air pistol

I bought this used last summer and it was fine except for the 100lb trigger pull.I was trying to adjust it and the pull was still way to much so I loosened the trigger screws so much that they flew out of the pistol and went sailing somewhere into the backyard.Now when I cock it the sear doesn't engage.Desperate I screwed in some machine screws I had laying around to no avail.Still same problem.Does anyone have knowledge about this problem that can advise me? I'm heartbroken this was the most powerful accurate pistol I've ever shot,and yes that is a tombstone I work on. I have no experience with airpistols and have just started learning about springer air rifles pcp's are what I'm used to.Also I can't find any diagrams,info on the net, or real forum advice anywhere.I really at a loss here.

the trigger adjusting screw in the quattro trigger are 3x1mm go to the hardware store and buy some longer then needed adjust til you get the pull desired, then trim them down so they fit flush.

by the way, welcome to the Independant!!!