Broken engine coupler please help

So when my skis handle pole snapped and the ski ran away from me it sheared the couple off the engine, it is stuck on here but I have the cold fusion flywheel lock on the other side to hold it, I need advice on how to remove it, all I have tried is getting it real hot with a torch and hitting it sideways with a hammer to free it
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Location
Stockton
And where would the flat tip be placed

Hit it Here on the shinny surface, upper left of this photo, the area with hammer looking marks already. Also below that in a counter clockwise direction looks like another flat surface. Iam near you and have a hammer and bit if you need help

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I had one once that would not respond to reasonable attempts, so instead of taken a chance of possibly twisting the crank by applying to much power (even with heat) , I ground a slit longitudinally , stopping short of the threads of course, then drove a chisel into the slit. That loosened the threads.
 
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