It has been a long while since I used one, but, I believe you must keep the gun pointed at the record at all times. Slowly and steadily pull the trigger until it is fully depressed, then very slowly and steadily release the trigger (all the time pointed at the record). If at any time you hear a click and you feel the tension in the trigger has suddenly gone away, you have either pushed or released the trigger too fast.
You can tell if it is working right if you can feel a slight breeze when you aim the gun at your own arm. Just don't touch the tiny pin in the barrel while pulling the trigger, that little experiment will hurt.
You can tell if it is working right if you can feel a slight breeze when you aim the gun at your own arm. Just don't touch the tiny pin in the barrel while pulling the trigger, that little experiment will hurt.