Double set trigger strength

[Cory Joe Stewart]

Hello everyone,

I have an older previously used double set trigger set that I am trying to use.  They function fine, but do not strike with enough force to trip the sear.  What do I need to look at or adjust to increase the force that the trigger hits with?

Coryjoe

[Bob Roller]

Hello everyone,

I have an older previously used double set trigger set that I am trying to use.  They function fine, but do not strike with enough force to trip the sear.  What do I need to look at or adjust to increase the force that the trigger hits with?

Coryjoe

Check the engagement of the sear into the full cock notch AND the strength of the sear spring first.
IF there is not a lot of resistance firing the lock holding it in your hands then you might try and bend
the spring that drives the rear trigger OR simply tighten the screw that holds it. I usually make my set triggers so this can be done. Be careful when bending the spring.

Bob Roller

[Cory Joe Stewart]

Thanks Bob,

The lock seems to function smoothly so I do not think it is that.  I did check to see if the sear was digging into the stock creating more resistance.  I think the issue is going to be bending the spring.  I will tinker around with it some.

Coryjoe

[JTR]

Another way to strengthen a spring is to put a shim under it, then tighten the screw down. Sometimes only a few thousands thick shim will improve the strength of the spring surprisingly. You can shim it to test the effectiveness of bending the original spring, or use the shim as a permanent fix, depending.
John

[D. Taylor Sapergia]

If you intend to bend the spring, I wouldn't try it without red heat, and that of course, necessitates re-hardening and re-tempering.  My test of the power of the trigger mainspring, is to hold a medium sized screw driver with thumb and index finger on the end of the handle, hovering the blade's tip just over the cocked trigger.  I fire the trigger, and the hammer trigger should give the screw driver a decent kick.

[Dennis Glazener]

Hello everyone,

I have an older previously used double set trigger set that I am trying to use.  They function fine, but do not strike with enough force to trip the sear.  What do I need to look at or adjust to increase the force that the trigger hits with?

Coryjoe

Cory,
If this is a Davis trigger first check the tension on the main spring screw. Many of them are not very tight, screw it in and it will increase the tension on the main spring. I suspect that is the problem.
Dennis

[bgf]

Also make sure there is enough clearance between trigger and sear bars.  The trigger works more on energy/momentum than pure spring force, so if there is not sufficient range of motion, the trigger bar may not make enough headway to trip the sear.