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piers - cast iron
Another excellent option is 100-150mm diameter cast iron - heavy, but its crystalline structure has excellent dampening properties. These can be had as recycled material and often have fitted flanges for attaching to the mount base or a concrete foundation. The old Meade users website forum used to have some technical excellent analyses of the pros and cons of differnt permanent pier materials.
I have an old cast iron stage light base adapted for a GEM base - it is an outstanding low vibration base. Almost as good as the large concrete and steel pier in my observatory.
guy
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