[Raymond]

Dear all,

I am planning to tailor-make a metal pier to be placed at the building roof top for my TEC140 F7 refractor (with imaging gears 26-28lb; and 40-inch long with dew shield fully extended). Concrete pier is out of the question.

If a 36-inch long metal circular tube (wall thickness about 1/4 inch; and about 6-8 inch diameter) is to be used as the vertical pier, which metal (aluminium or stainless steel) would have better damping and stability properties ?

I plan to use 3 metal legs. Each leg will be about 24-28 inch long. Again, which metal (aluminium or stainless steel) will be a better choice in terms of rigidity ?

Thanks in advance for comments.

Raymond