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OK, then plan "B": contraction - after been heated real hot... I don't think it would affect the shaft if you heat the key (or what's left from it) to light red and then let it cool down. Not the full lenght; just one inch at the time! And of course, heating had to happen with your biggest...

You are posting the same Q. again... did you try clamping them very tight with a Vicegrip and then hitting the tool with punch & hammer? Shown here; has always worked for me. G.