This is not an aluminum bodied FW by any chance??
If grinding new notches on and trying again with a FW remover does not work, just tear down the FW till all you have is the bare FW inner core left on the wheel hub (remove pawls and spings too.) clean off all the grease and oil off it and go at it with a large pipe wrench. You can even aplly a bit of heat on it to to help crack it off the hub threads. Be aware that using a pipe wrench might mean the end for the FW, but at least you will have it off the hub.....

Chombi

Oops, just noticed that Pastor Bob had pretty much gave the same exact tip two posts before me....