Quote from tekkie:
i was working on a sewer OoB too - this is the best i have :s
btw the clip is in the ceiling where it meets the wall where the pipe turns into the wall. the chair makes it way easier. (clip at around 1:16)
That's the same clip I'm using. You can actually boost up without the chair, and I've optimized the clip quite a bit position wise to get it fairly consistent. I'll record it soon.