Turn the pivot screw in small increments with the correct Torx bit and test after each one. The target is the loosest setting that shows no side-to-side blade movement when the knife is locked open. Too tight and the action drags; too loose and the blade wobbles and loads the lock unevenly.
Loosen slightly, then close and open the knife and push the blade sideways with it locked. If there is play, tighten a fraction. If there is drag, loosen a fraction. Two or three iterations usually lands it.
On a flipper, test whether it still fires at each setting. Flippers are more sensitive to pivot tension than thumb-stud knives.
Use the largest Torx bit that seats fully, typically T6, T8 or T10. Factory thread locker makes the first turn stiff, which is normal.
Some makers treat disassembly as outside the warranty. Adjusting the pivot is normally acceptable; taking the knife apart may not be.
If the blade moves back and forth while locked open rather than side to side, that is lock wear and no pivot setting fixes it. See lock play.
If the action is gritty rather than tight, clean the pivot before adjusting anything.