Correct,the trigger pin has two notches,one on either side that the "legs" of the hammer spring rest in.If you take a punch and partially push the pin out you'll see one.AZ's pics are great,but it's hard to see the groove in the pin.Just try to center the pin as much as possible then pull up on the legs and sit them out as close to the side of the receiver as possible and they should just line themselves up.