Much obliged for all that input, Wayne
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Originally Posted by kronckew
shells were cast in sand molds with the central sphere of sand/clay that would be removed thru the hole later....
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Let me not think that this example was stolen from the Arsenal and the present contents is still the casting inert material
... just kiding
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Originally Posted by kronckew
... possibly being in the home of the cork oak, they found they could use a smaller hole with a higher quality cork plug? ...
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Nice reasoning ... and another use for cork
