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Yes soft hammer will help.

Heat it or try to cool the crankshaft with some freezer spray while your push it from behind with two flat screwrider if the soft hammer isn't enough.

If you really can't remove it, you'll have to cut deep into it preferably inline with the key and shock it with a hammer and a chisel. It will make it loose enough to pull it.

But you'll have to buy an other one obviously.

Does it move even a mm?

Tried 2 screw drivers behind it gently and evenly?

Usually the shaft of the crank may need a polish as it has high spots from the balancer marking it.

I did one for a workshop a few months back that they were struggling with (2JZ), just the crank snout needed a clean as it was getting stuck on it after moving 1 or 2 mm.

If the gear wont come off and move at all, give it a few whacks face on with a brass punch to help shift it and get some WD40 inside the join points to free it up.

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