When I went to remove my flywheel today, I found that all of the hex bolts
had been rounded a bit by the engine's previous owner.  I managed to get
four of them out with no real problems (just hammered the wrench into the
bolt head).  The last one was, and now is more of, a mess.  I had applied
WD-40, tapped it with a hammer, and applied heat.  Any suggestions on what
to do now?   I'm planning on drilling it out tomorrow.

Thanks,

Karl Wolz