Think I've almost exhausted my options, but never hurts to hit-up the collective wisdom of GJ
Sprocket is on a snowthrower (JD 510 tractor, M03280 snowthrower) - so parts are mostly made of unobtainium.
I've tried heat (propane and MAPP), PB-Blaster and wax, hammers, and a 3-jaw puller. I can...