Nicely done! I love the minimalist approach to your tooling.
I've a couple of questions:
What did you use to press the PVC pipe down?
It looks like your 1/4" extension has a deep socket on it. What size? just big enough to straddle the keepers?
I guess the vacuum hose has a ID small enough to grip the valve stem and allow the drill to spin it. What's with the flared portion on the end?