So many ways!! Here's mine: hold real tight with a couple of vise grips, then get ur sawsall out, & with a big vise, twist one vise grip & the AN clockwise while cutting her with really sharp wood blade... sure, you may get a few steel "straglers"... but if you just grind those off @ the end with yer binch grinder, you will be fine. Oh yea, remeber to put lots of duct-tape on there.
Actaully, I use a think die griner too w/ thin black tape.