Dave brought forth on stone tablets:
On Wed, 30 Jul 2008 16:17:15 -0500, Vic Smith
said:


Soaking with your
choice of a "rust-buster," then whacking repeatedly, coming back later
and whacking a bit more. Only loosen the nut enough to protect the
end threads from the hammer, and bang on that


Been there. Done that, though I'm not so concerned about the end threads as
the replacement bolts are readily available. In fact I hit the nut
protecting the threads hard enough with the hammer to deform the threads
even with the nut on.

A nut buster is sometimes the best and easiest solution, if you can get
it on the nut, and if the nut is a "low value" one. It is frequently my
FIRST choice.

bob