This is at the bottom of the housing when it is mounted on the bike. What is this and what does it do ? The "lip" right above the Comstar bolt.
The flat metal piece that bends around the bump. I was wondering if it was a vent of some sort.What are you referring to, the flat metal piece or the bump on the housing? The flat metal is part of the cover that surrounds the housing, I think it's there to route any gear oil leakage outside the wheel. The bump is where a screw goes in from the other side.