Grose doesnt copy props to sell to the masses if you have a prop stock or worked you can digitize it and keep it on file until you need one if you hand work a prop there is no way to duplicate it exact by hand but a digitized CNC is damn close as GN 7 stated no 2 standard props are the same , no standard prop manufactuer is going to duplicate anything .Grose has their own design stuff that seems to work well.