Andrew, If you take ALL the bits & pieces, eg, mirrors etc etc, & weighed your steel tube, you would be surprised how light it actually is. Why do you want to change it?
I have added extra lead as counter weights to my t'scope & now the all-up weight,(inc.base,battery,E/Pc. box, etc), is around 40/45 kilos.
It does not move when the wind blows. It has MASS. Solid as a rock.Moves really smoothly, when I want it to. Plus it's a SONOTUBE. ie; cardboard.
If you want a lighter tube. WHY?
L.
Sorry If I've ruffled anyones feathers.
ps. I had been using one of our members t'scopes(10" Bintel) one nite & a puff of wind came up. The t'scope was shaken & vibrated so much that I couldn't see the image.
Just the facts m'am.