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Your best “tool” is to use a lot of patience. Go slow, soak with penetrant of your choice, repeated heating cycles will help too. Can you tap (hammer!) on a hardwood dowel down thru the spark plug hole? Do not try pulling hard on the connecting rod, likely break the rod. Since the piston skirt is exposed, try supporting the skirt on wood (wood board with hole to clear the rod end) and pressing on the cylinder to gain some movement, if it moves , then work it back and forth. Using the “grease – gun ” pressure system will require blanking off the ports which may be a problem considering how far down the piston sits. If you end up “pulling” don’t pull on the rod, try to get a hold on the wrist pin , wrap wire etc and pull from that. I like the “start” pushing in approach , get some movement going. … Patience and soak.
Joe B