Haha, thats funny... Those things are holding up the shelf that is supporting laptop i am posting from... Mine are 5/16" though.

Im gonna bring my entire block and an allenhead wrench and just browse OSH for an hour looking for a good nozzle solution, O-ring/washer, And some bolts for a Hardmount. I'm hoping I may be able to find a PVC thing... Dont know what its called, but Ive seen it... That (with a little sanding and some drilling) will seal the middle gap and work as a nozzle. I don't know if ill find one with the right OD, Sure hope I do.