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Never saw this particular page before, I don't think. But, they're all basically the same. Make one, and all the mystery is explained. I made a batch of them. Work good, and very inexpensive - like about free if you use scrap plywood. I figure some of my "expensive" ones ran me about 25 cents (U.S.) each.
JOAT Viet Nam, divorce, cancer. Been there, done that. Now, where the Hell are my T-shirts?