all kinds of handles are tuned on a lathe. Most commercial hawk handles have both a taper and an oval cross section that slowly progresses to a tear drop cross section at the poll. I have been a wood turner for years. Turning such an item is an art that is now done mostly on cnc machines. I am just now getting into turning off center, which most turners never attemp, other than to make a crank shaft looking candle stick ....once. The next problem is curly maple is notoriously prone to tear out regardless of how sharp the tools. Even sanding over the waves of grain can cause tear out. It might require stabilization with an impregnating resin just to prevent tear out. I know enough to know that I am not your guy. There are a few guys that are specialists at eccentric turning. A fellow outside of PHila, named Mark Sfirri has won several awards and is probably light years beyond your price range. Here are some of his baseball bats:
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I took a class he taught years ago. It was so far above my head, that I barely understood what he was saying when he said it. His web site:
Mark Sfirri
Another place to check might be the American Wood Turner's Association.