You can cut a clean hole with a wood spade bit in an existing hole.. if you give the bit something to center on. Like a piece of wood held inside the body over the hole. Or, run the bit through a 2x4, hold it to the outside of the body and and use it for a guide. Not as clean a hole as the first idea.
To Invent, you need a good imagination and a pile of junk. (Thomas Edison)
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