Join Date: Apr 2011
Location: Triad, NC (from the PNW)
About 3-4 inches long and approx. 1/4 inch deep (both sides if it is all the way through) should work. I don't know of any hard rule for either, but they need to be thick enough to actually do something. Although erring on the side of thicker wouldn't hurt, just more work and material.
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