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Gday Chris
I think most people overthink/design piers
By machining an internal taper into the pier, you may spread out /disperse any internal resonances but at the end of the day, what stimulates the vibrations you are trying to kill????
Most random "vibrations" in piers come from ground resonances, and they have complex sources. A 9" dia pier with 10mm walls will be massively stronger than required for most situations, and simply filling it with a wet sand slurry will kill off most vibrations.
I find it funny that people will spend hours trying to make a "solid" pier, and then use a plate supported by 4 freestanding bolts on top to mount the scope. Its sort of like gaffa taping a micrometer onto the end of a 12" wooden ruler.
Andrew
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