I don't know a way to do that. Means you have to restart from scratch.
Just a few hints.. there are lots of pssibilities to create shapes that you can lathe
Create / Pen
Create / Sketch
Once you have created the shape you plan to lathe (using either method above), you can adjust the shape by dragging the points around individually with the "drag" tool -- "Modify / Drag" (Ctrl - T).
If you wanted to create more accurate curves, or make a closed curve, they can be made more manually by using the Create / Points tool, and then choosing Create / Make Pol, Open Curve, Closed Curve. This would be my preferred method.
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