Crank extractor too small?

okay, i think its the right size, just that the axle is a threaded one, onto which a nut secures the crank, rather than a bolt that goes inside the axle. does anyone have one of those types of extractors?

riding it off and hammering it off aren't options, the cranks are really seized on!

okay, I have one that I think fits them, will check innabit, dunno when I'm about though.
Have you tried riding them off?