One method I've had good success with is to back off the bolt as far as you can so it's pushing to it's max. Now place a hex hey or punch into it, and drive it with a non-steel mallet, my favorite is a wooden or paper one, but just anything is acceptable except steel.
The blow adds additional force above that you've already loaded and drives the spindle, while the crank's small momentum is enough for this trick to work.
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Last edited by FBinNY; 10-02-16 at 08:57 PM.