I was finally able to remove the flywheel today. There's a big 54mm nut torqued down rather tightly holding the flywheel on the shaft. When I looked for a socket in the past, they were around $50 (!). Today, I found a 2-1/8" socket for $28 at Sears that should work. I'd purchased a cheap little Harbor Freight electric impact wrench years ago and figured I'd try using that to remove the nut (my back up plan was to borrow some air tools). I also bought a set of adapters that would allow me to use the 1/2" drive wrench with the socket, which takes a 3/4" drive.
That's a huge socket, huh? The impact wrench worked surprisingly well. The nut was off within 2 minutes.