Same method, punch, pilot, step, 7/16, tap. You can see that I was a little off to the left but the bit is large enough that I still caught the vein just fine. With this hole, you need the 7/16 bit to touch the bottom of this vein in order to get enough engagement on the fitting. BE SURE NOT TO PUNCH THROUGH THE BOTTOM AS THIS WILL RUIN YOUR BOX.
