Gary,
I knew it would polish up beautifully! Glad to hear it is also running smooth! However, it's hard to set a price for it, and as they usually say here and in the other groups, it's only worth what someone is willing to pay you for it. On one hand, it's in great shape, all original, and rare, as I said I've never seen a Modern Hygiene upright before, only tanks. On the other hand, someone might look at it and say, "it's just a rebadged Royal." If it were me, I'd keep it, but if you really want to sell it, probably the best thing to do would be put it in an ebay auction and see where it goes.
To answer your question about fan removal, if you've ever removed a fan from a Kirby, it's pretty much the same process. You need to keep the shaft from moving while you turn the nut (and the fan) CLOCKWISE, as it has a reverse thread, and be very careful not to touch the windings or plates on the armature in the process. Usually I hold a screwdriver against the cooling fan to do this.
Jeff