I just bought a used powermax 30 air and it has a different design on the gun compared to my powermax 45. It has a plastic deflector with number 420399 that seems to be burned. In the consumable kit there are only Cooper ones with holes in it and they look Quite different but has the same part number. I also see Jim from hypertherm not recommending the plastic deflector on thicker cuts but what about the copper ones?