Some may cringe, but I usually back out the adjustment screw until it touchs the 5mm screw that holds the trigger to the action. Then if the trigger isn't light enough to suit me, I trim about half a coil off the spring. If I want it lighter, I may trim another half a coil. Usually never more than a half a coil at a time. I get a very crisp light trigger and it is safe. If its to light, then screw the adjustment screw back in a little. I do this on all my Tikka's.