Well, I got some good news! The guy I bought it from refunded my money, even the shipping and told me to keep the parts. So I guess there's still some honest people selling on Ebay.

I also found a case with good bearings so I picked it up for a few $. Since I'll put the sloted cylinder on, I figured it wouldn't be all that good for an airplane engine, so my son and I will make an airboat out of it.