He pushed the screws too far,, the trigger sear is skipping the tumbler..
We need to know what gun/ lock/trigger he's messin with. Lyman/TC or Traditions/CVA.
It makes a difference. Some have one screw,some have two,, some even have two screws on the trigger, and another on the lock!???
If it's "way" out of adjustment you can damage or even break the trigger sear. That's a bad thing,,then ya gotta wait fer parts, :cry: