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The simplest way to think of a pier and its load of mount and optics is a vertical spring with a weight at the top. This system will have a resonant frequency that can be energised by any energy source such as a motor.
To minimise resonance of a simple cantilever parallel beam, the tapered ribs will make the system have resonances that are multi modal. That is it has many more possible resonant frequencies so making the amplitudes far smaller and damp far more quickly.
The dull thud says it all!
Below is an image of my pier.
Bert
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