Thanks for the tip to use Liquid Wrench. It did the trick! However, I had to
sacrifice a very inexpensive Oldham Plywood saw blade -- that was a small
price I gladly paid. If I had overtightened the arbor nut, then it is very
difficult to gauge how tight is too tight and how loose renders the
operation of the saw unsafe. It took enormnous force even after the Liquid
Wrench was applied to move the nut very slightly before it would turn
easily. Given the slight turn that was required I doubt that the nut was
overtightened to begin with.

Thanks to all who attempted to answer my question, and I appreciate all the
suggestions that were made.
"Phisherman" wrote in message
...
On Sun, 12 Dec 2004 10:15:15 -0500, "Tom Holman"
wrote:

Trying to remove a plywood blade, and when I lodge a piece of hard maple
against it, it is not enough to prevent blade from turning and nut on
arbor
will not move. I am trying to move it counterclockwise. Anyone have any
tricks? Help!


Try another piece of wood. I've tried a clamp and found the jammed
wood works better. I like using a soft wood as it bites into the
teeth better. Put a couple drops of Liquid Wrench on the threads and
(lightly) tap the wrench with a piece of wood.