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I will let you know later tonight  . No seriously, I will check my Hammers.
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I have a "Proto" of the first run larger diameter Hammer. It's yellow with a red mini Star stamp, just like the Sidewinder. Then, the next stamp was of the Hammerhead shark.
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Well I checked them, and they are both 21,2 cm, as Dave says, it must have something to do with plastic,... probably cooling also?
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Mostly plastic, but yes cooling, running temperatures, pressures, speeds, etc.