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@BrickMan
the hammer/old screwdriver method does have its uses! I managed to remove an absolutely Mullered malliard (see what I did there?) 5spd block with the method within seconds, yet using a proper fitting tool on a 10" wrench wouldn't give it to move anywhere. The impact of it was probably what got it moving.
Putting it in a vice is about as much force as you can exert on it before something breaks. Over the years I've helped destroy/actually destroyed/heard of others destroying wheels trying to remove old freewheels/ old freehub bearings and cogs by putting them in a vice and twisting to the point of spoke breakage, flange distortion and in one brilliant case (cheap town bike wheel) the actual threaded area of the hub casing ripped/ twisted off the main part of the hub body*
*I bet the guy that did it thought he had finally cracked it, and then when he lifted the wheel away from the vice and found part of the hub still connected to the vice, probably uttered some expletives.