Two possibilities: 1) Mount a 5 mm allen key in your vise, so the business end is up, but just a bit out of the jaws. Now use a very large screwdriver, ground to fit, so you can push down hard.
2) Dremel with pointed carbide tool to grind through
Good Luck!
harvey
At 10:23 1/9/2001 -0500, Tom Hayes wrote:
>I have a chainring bolt, campagnolo, that I have so far be unable to get
>off the crank. It is holding (the remaining one) two NR chainrings mounted
>to a GS crankarm, if that makes any difference.
>
>I have used the appropriate Campagnolo took with the little prongs; one of
>the backside slots is now slighly mangled. The bolt and fastner keeps
>turning together, and I cannot find a tool, or any other device--already
>tried a large screwdriver-- that will fit the slots that I can hold
>sufficently tight to loosen the screw with the hex wrench. I've tried
>needle nose pliers holding the backside, used enough liquid wrench. I've
>exhausted my limited understanding of tools and bankrupted my equally
>limited imagination for devising something that would work.
>
>Any help out there.
>
>Thanks.
>
>Tom
>Tom Hayes
>18585 Munn Road
>Chagrin Falls, Ohio 44023
>hayes@jcu.edu