On Tue, 19 Sep 2006 10:37:19 -0400, Gogarty
wrote:

Before I
break anything, is there a really. really good loosener upper for corroded
fasteners?

Kroil, or more properly, Aero Kroil is widely regarded as being the
best. As far as I know it is sold only on the web but you might be
able to borrow a can from a professional mechanic.

PB Blaster is also pretty good and is widely available at auto parts
stores.

Apply, tap lightly with a hammer, reapply, and let it sit overnight
before using a bit more and tapping again with a hammer.