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Bloody Marvelous! Very clever and clearly explained. I've have had pen classes, but this was just as good or better
Great to see something so neat made with so few tools. One tip on the lathe: move the lathe tool rest closer to the work down to 1/8" from the wood, or as close as the tool bevel will allow. It is safer and you will get less chatter.
I know that vacuum pumps are available at HF, but I have never seen a vacuum chamber there.