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Casting poored from a formula of slightly more magnesium moving the alloy from a 356 t6 to 357 t6 yielding twice the tenses strength of the old original cases. The case is machined in a fixture that allows for an absolute zero  X, Y, and Z thru out the entire case because ......it is never moved once locked in place.  Unlike the originals that were done and moved on a Bridgeport mill in the 50’s and 60’s. Just saying.....