I GOT IT!!!!!
I put the locking nut back on the shaft, upside down and tightened it down to where it was smooth with the top of the shaft. Took a !/2 inch drive socket and put it upside down on top of the nut so I gained as much surface area as possible. Drove 3 chisels under the pulley and on top of the bolts holding the thing to the deck. Sprayed it with PB Blaster, smoked a cigarette.... started tapping the socket and low and behold the thing started moving!! Finished up with a smallish crow bar alternating bolts and tapping. Easy peezy
I'm off to ebay to get a new pulley!!
Thanks y'all
I'd also like to thank my dad who taught me the value of 'tapping' rather than 'beating'.