Gday Geoff
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I'm curious just what your final word would be.
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Do you see, in your opinion as an engineer, the need to fill the pier with sand?
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Based on gut feel, i would probably use sand oil if i had it handy, but wouldnt worry if i didnt. There are plenty of empty steel piers out there that work perfectly well :-)
Also, based on the size of your pier, i dont think there would be much difference between the methods, as it is already massively stronger than required. The only thing that will hurt it is an accidental bump, but people normally bump the mount/CW shaft or OTA, not the pier, and as such the pier "strength/damping" is pretty much irrelevant in that scenario.
The inner geek in me has always thought it would be fun to stick a series of accelerometers onto a mount, and see what really happens, ( esp when manually focussing in visual mode ) but i haven't got up the energy to do it yet.
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In other words, I need to get it right.
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Either method sounds perfectly good for what you describe.
Andrew