Thanks for all the advice everyone. Since I waited to remove the crank as the last step in the complete disassembly of the bike, I didn't really want to put it back together again to ride around for removal. I decided to pick up a cheap pickle fork at the local auto parts store (little under $10) and spent a good 30-40 minutes (about 29-39 more minutes than I initially thought it would take) hammering away. It still took a lot of hammering, getting it jammed in there, rocking it a bit, moving it around the crank, repeating, etc. I didn't even have a chance with the regular crank puller. I would be nervous doing this on a pricier bike...but for this Schwinn, I was okay with the risk. I got it off the bike. Bike is fine, and I have a different crank to put on it.