It's a waste of money because that plug wasn't designed to do what you are asking it to do. Use a copper core plug and be done with it.
I stopped using N series Champion plugs back in the early 90's. Use the C series. Instead of the 13/16 hex the N series uses, the C series uses a 5/8 hex. It's much nicer to use a 5/8 plug socket than that big, clumsy 13/16 socket, especially if you have headers.