I do what Rock said measuring in 1" or closer increments. Then I draw the plug in Autocad. I know not everyone has Autocad but graph paper and a set of curves worked well since the Romans were building aqueducts. If you can draw the true 1:1 plug in a notebook then make copies of the drawing. Lay the copy of the original drawing on template material lexan hardwood what not and adhere the copy to the template material with some spray on glue. Then you can cut the template based on the original drawing.
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