Author Topic: Lyman GPR "Hair" Trigger Adjustment Screw (Read 698 times)

pendennis · « **on:** October 13, 2003, 07:21:47 AM »

Does anyone have the screw size of the adjustment screw for the Lyman GPR? I tried #2 and #3 screws but they are either too small or too large.

It looks as though the trigger pull could be significantly improved if the screw were a little longer. It appears to be about .25" in length.

Lyman states that the screw is purposely left at the current length to discourage over sensitizing the trigger.

PA-Joe · « **Reply #1 on:** October 13, 2003, 09:37:56 AM »

I don't know what size but have been told that a TC set trigger screw will fit. It will not help, much. I tried it. Better to get a trigger job.

tommy4toes · « **Reply #2 on:** October 13, 2003, 11:43:00 AM »

Dennis, you got an old car stereo laying around ? Thats where I found mine. I think it was found as part of a broken Pioneer tape deck

t4t

pendennis · « **Reply #3 on:** October 13, 2003, 01:35:57 PM »

Guys, I solved the "great" screw mystery. The screw is a 2.5mm. I ran across some packaged metric screws from my camera gear. I laid in some extras a few years ago for my medium format camera. The actual dimensions of the screws are 2.5x8mm. Any 2.5mm will probably work. These have a knurled head with an allen wrench fitting.

When I installed the screw, I hand tightened it all the way down. Once you go so far, the rear trigger WILL NOT SET. I backed out the screw until the rear trigger set again, and then further adjusted until it felt right. I can use a little threadlock if I want to insure the screw doesn't move.

Thanks for the replies.