A quick and dirty look at the marble pump in action on its own. I'm no cinematographer so you'll have to live with the phone-cam quality and text narration.
It's staggeringly hard to get 17mm drill bits (regular, spade, or forstner), and the same for router bits in Australia. I gave up and went with 18mm bits, despite the fact that marbles are 15-16mm.
The pump shown here is a little "loosey-goosey" as it was my 1st build. The others are a little leaner in action.
Great little gizmo anyhow.
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For some reason the Youtube Captions are intermittent. If you don't see captions then this will be duller than expected, trying to fix the problem. Try again later
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