Backyard handyman method for flaring copper coil end?

ZRrrr said:

This site is always great for ideas to solve little home job issues so here is another for the smart and handy....

I'm too cheap to buy a flaring tool for a one off job and not the kind of guy who would be comfortable buying it, using it and returning it. Need to flare end of 3/8" copper coil. Any ideas on how to do that the backyard handyman way?

Thanks in advance.

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