double set triggers

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See page 27 & 28 of the TC Sidelock Manual for the section titled "Understanding The Various Rifle Trigger Mechanisms" for a picture:


http://www.tcarms.com/assets/manuals/current/Shooting_TC_Side_Lock_Black_Powder_Guns.pdf

ADJUSTMENT OF THE SET TRIGGER

The adjustment screw located in front of the rear trigger controls the
amount of set trigger engagement. This adjustment screw has no affect on
single stage trigger pull! Single stage trigger pull is non-adjustable.
The set triggers on T/C rifles are adjusted to our production standard before
shipment. Triggers are adjusted to what we feel is an optimum let-off travel.
In order to check the adjustment for let-off travel, the following procedure
should be used: With the rifle uncharged and unprimed, place the hammer
in half-cock position. Set the rear trigger. With the trigger “set”, carefully turn
the adjustment screw clockwise until the trigger mechanism “snaps” into
“unset” position. Stop turning the instant the mechanism “snaps”. Do not turn
the adjustment screw beyond this point for it marks the instant of total
set trigger disengagement. Once the mechanism “snaps”, turn the adjustment
screw counter clockwise one full turn.
This is the minimum setting for let-off travel with the trigger set. If you
require additional let-off travel, continue turning the screw counter clockwise
until you reach the desired engagement. In no event should the engagement
be set at less than one full turn counter clockwise from the
point of total set trigger disengagement.

WARNING
IMPROPER USE AND/OR IMPROPER ADJUSTMENT OF THE SET TRIGGERS CAN RESULT IN AN ACCIDENTAL DISCHARGE WHICH CAN CAUSE INJURY AND/OR DEATH TO THE SHOOTER OR BYSTANDERS AND DAMAGE TO PROPERTY.
 
It is the little screw between the triggers. You can probably turn it with your fingers. Turning it in makes the set trigger more sensitive, almost so sensitive you can fire your gun with a breath. I suggest you don't go for the very light pull as your gun can fire with a bare brush of the trigger.
 
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