A friend (????) just sold me his used John Deere 30S weed trimmer. I'm learning my way around the unit (can't find a free instruction booklet pdf. like I found for my Husqvarna garden tractor online) but can't seem to crack the mystery on removing the trim line head to replace the line. I got it open once quite by accident. I'm ready to take to to church tomorrow and ask for an exorcism after services are over. Anyone have a tried and true way to remove the head without dynamite?