I fired her up this morning and tried pulling the clutch. Same knock, no change. Granted I didn't warm it up the whole way, but I imagine the click would have gone away either way.
In the video I didn't look but after I pushed her back under my porch I checked for those two bolts and they're on and gripping strong. The clamps are also tight. I felt around with my hand (which I know isn't very scientific) and I didn't feel any air pushing out where it shouldn't be.
Link to original page on YouTube.