Running 220v from 110?

I've run a 220v circuit in every place I ever rented. I used the better to beg forgiveness than to ask permission philosophy. I straight up busted out the 3" hole saw and went through the garage wall to access the outdoor mounted panel at one place. I have made holes from utility closets into garages twice.

If you do this, do it right and use quality components. Make it permanent and clean. Make it look like it belongs there. Landlords have yet to raise a questioning eyebrow on moveout inspection. Like nothing ever happened.
 
There is an easy way, but only if the wiring in the wall is 12AWG and only if the 120 outlet is dedicated and there are no other outlets or lights on the circuit.
 
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