Lyman Great Plains .54 cal percussion, missing a set-trigger adjustment screw.

[gunpa]

Got the same problem with my Investarms. 2.5 is all the hardware store has and it's too loose.

 

[Forrest Smith]

What I did was, I found a set-screw for a Italian Sharps double set trigger. I have not idea what size it is, but took the chance they would use the same metric screw for both set-trigger. It fit in just fine, Not sure if it is the correct length yet, but I have a screw of the right size and pitch to go from now.