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Is this what you're looking for?https://www.scottrotaryseals.com/products/rotary-timing-valves/
Very clever design. Nicely done!
Another source for pure bentonite clay is a well drilling company. Ask is you can buy a bag of "driller's mud." It comes in a finely powdered form and is great for use in making green sand. A 30-pound bag will last a long time.
Thanks for this 'ible--a simple, clean effective design. The bottle opener is quite clever.Below are a few pics of the version that I made as a raffle prize for a local 5K charity race. The pallet had some nice rough machining marks that I tried to preserve by sanding as little as possible. It was finished with four coats of a wiping finish made with equal parts of spar varnish, stain, tung oil and turpentine.
Thanks for the kind words, -BALES-. I figured that while I was cutting the dado for the shelf, I might as well cut one for the bottom. It does clean up the look. Regarding the wood plugs, it's a matter of preference, but I really don't like the look of exposed screws on projects like this. So I countersunk the holes so the screws were seated about 1/4" below the surface. I cut the plugs from a pallet board remnant so the grain would match closer. The rack hasn't been raffled yet since the race is this weekend (May 21, 2016). However, there were a number of positive comments to these pictures when they were posted to the event's Facebook page last week.