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Shaking the Geneva tubes manually got
to be a drag so my husband and I collaborated on this mechanical
shaker. Some of you might be interested enough to make your own.
It's mostly obvious, but it took drilling three mounting holes to
attach the right-angle channel to the back of a saw blade. Those
blades are made of hardened tool steel that ordinary drills can't
touch! Even cobalt metal drills quickly dulled in the process. The
only thing that finally got through was a 20 thousand rpm tungsten
carbide burr. We have no patent on this so help yourself guys--haha.