use the 20 amp breaker!

you MUST straddle the 2 incoming main lines to get 240.

you are just getting 120 twice.

move some breakers around.

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its easy to do my neighbor was ready to return his new 6 HP compressor.

I walked over took one quick look and told him what was up. he thought
me a miracle worker

Only thing I had done the exact same thing years ago setting up my 240
volt compressor