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Old 01-09-2015, 10:44 PM
geelhoed geelhoed is offline
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It's not about the weight of the magnesium! It's got to do with the hardness or metalurgical makeup of the magnesium that it doesn't mark the aluminum and allows it to shrink even though it is being hit by the hammer. Magnesium is just a different acting material.

Andy Geelhoed(guesswork)
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