Leading up to this photo, I followed the drill template from the BAE guide. I'm not sure if BAE sent special drill bits & taps, but you really need some shallow tools to do this properly. It's easy to hit the oil deflector with a standard tap or step drill bit. Also, if you don't drill precisely, you'll run in to a supporting rib in the lower crankcase which will make using a tap nearly impossible. Which is what I was left with. If I did it over, I'd buy a weld-on fitting, have it welded on, and then carefully drill through the fitting into the crankcase. Everything is oily as hell in this photo because I got a little overenthusiastic while flushing out the shavings from the drill and tap.