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Gday Peter
The strength/stiffness/deflection calcs are only part of it.
Deflection is very rarely ever the controlling factor in a pier.
ie take an identical tuning fork design ( ie same moments of area etc )
Make one from tuning fork steel and one from bog std Mild steel.
Totally different end results :-)
And again i put it that if the knock/vibration is induced via the mount or OTA, then no amount of pier strength will save you.
Andrew
( also did Mech engineering incl vibration analysis )
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