When you don’t have much extra material to turn you need to find the exact center of the workpiece. In this case I have only about 1/16″ of waste all around on the small side of the oval. This is also compounded by the piece being oval.
The solution is simple. Use the center gage of a combination square set and mark the layout lines from all four sides of the oval. The exact center is the center of a box formed by these lines.
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