Just adjusted the weight of pull of my AIII trigger. Backed out the screw by 1 turn, did a considerable difference but my knowledge in gunsmithing is limited so i didn't want to go further. I had trouble to get the jam nut off i had to file an 1/4 wrench, what the size is these nut? 17/64? Well i couldn't find any key for it so i did my own. Any1 else did this and if yes how many turn did you back it off? Thanks in advance, appreciated.