feddtrucker, if you haven't got that helicoil out yet you could try an easy out tool. used to work for me when I was a millwright. Also if you get it out buy a 7/16 starter tap and finishing tap for hardened steel. can buy at graingers. also buy or make a tap extension so you can go all the way back. use plenty of cutting oil and back out and clean every couple turns in so it won't hang up and snap. then buy order a grade 8 7/16 x 3 bolt from home depot. Good luck.