lowering 'keiths way'

[xs-style]

As many of you know our resident gm guru Kieth showed us how they used to do mild lowerin jobs with spring hanger relocation. His write up for it is in 'the drop thread'. Its a good write up, but I beleve he did his when it was fairly new. Age seems to have added a few degrees of difficulty, so I need a few tips on this. I've ground the heads off the bolts on one side of the hanger. The prolem from there is that the rivets are invincible. I've tried steel drill bits. They barely make an indention. I've tried heatin them up then drilling with no success. A chisel and a BFH just makes noise (although its good stress relief). Has anyone ever done this and actually succeeded? Id sure like to know how..
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