The scenario: You need to remove a snowmobile clutch but don’t have a puller, or traditional methods aren’t working.
The theory: Water fills that void where the puller would go. By threading a bolt into the snowmobile clutch, hydraulic pressure builds in the void, forcing the clutch off the crankshaft taper.
The process is simple, so much so, that you may never use a traditional puller again. Complete instructions are available here at sledmass.com.