Originally Posted by pluckit

Take the lock off (the part with the hammer connected to it) and on the inside you will see all the parts that hold the hammer back and make it drop when you pull the trigger. The sear is the part that the trigger knocks the hammer off of (or that the hammer rests on). There should be a small screw there that you can adjust for the ammount of clearance there is before the hammer falls off the sear. This will lighten the pull on your trigger.