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Hi Guys ,I built my pier before I built my observatory, the pier in the first picture is a 90mm steel pipe buried 1mt into the ground filled with Mary river sand,the hight is also 1mt, it still vibrated so I surrounded with a concrete casing 20inches in diameter with a spacing if 12mm thick rubber 100mm wide which is the thickness of the concrete floor which the observatory was built on, It doesn't vibrate any more
The scope is a 20cm Celestron Ultima 8 purched in the USA in 1990.
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