On Sat, 13 Dec 2014 09:49:24 -0700, Robert Green
wrote:

....snip...
I've had some luck with a spray rust penetrant (one of the new
variations of
WD-40) and using a broom handle through the drain hole at an angle to try
rotating the blades. The handle gives a lot of leverage. I'd let the
penetrant soak as long as I could if you think it's "rust welded."
Reversing rotation direction with the broom handle might give you an
idea if
there's something wedged into the blade assembly. It might move
slightly in
one direction if there's a blockage. Use a broom or broom handle that's
expendable. They can snap in half if you've got good arm strength.

--
Bobby G.

Thanks for the tip. I actually have 'broken' two crescent wrenches and a
screwdriver shaft - not prying, but twisting.

I will look for this 'enhanced' WD-40

I used to use naptha and machine oil but that's a bit dangerous inside a
home.