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Old December 20, 2012, 10:06 AM   #21
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Join Date: December 14, 2004
Location: Maine
Posts: 3,199
However it strikes me that the vibration amplitudes would be 360 degrees around the barrel rather than just vertical, so the the variation may be in any direction.
Yes, barrel vibrations occur in most directions, but, by far, the greatest vibration amplitude is vertical.
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