I want to let you know up front, that one of the companies I have contacted in the past warned that the pantograph lathe would cause a great deal of damage to the original stock.
Don't know if that will be the case for every maker.
If it is a standard stock you want copied, the company should have masters on hand they can use.
BTW, I have had two of the basic model 200 of Terrco duplicators. They would/should not do any damage to a stock.