Yeah that's exactly what I thought initially.
Y'all keep one thing in mind too - when you're drilling and tapping, you are on your back drilling up so gravity is helping fall most of the shavings into your face. You're also drilling the bottom of the manifold, so the shavings can't fall anywhere but out the hole OR stay just inside the hole. That's where the magnet and Shop Vac came in handy. I venture to say that after I tapped the hole 95% of shavings were already out. If you want Smoke I can take a quick pic to show you exactly where I put mine.