Thanks Mark, yeah I've decided to go with 1" tube. Unfortunately three companies I have contacted today in Melbourne only have 1" tube with 1.6mm walls. This mean the ID is 0.16mm smaller than a tube with 1.2mm ID. I think the tolerances on the Moonlite's Delrin threaded tube inserts will cater for this small amount, would you agree?
Also, I've looked again that the Moonlite truss parts. I would need 4 x
TC100D for the secondary cage, and 8 x
TC100S for the Mirror box.
Or would you use the 8 x
TC100A for the mirror box?
And Mark, I as I may have mentioned to you over the phone last week, I have a habit of over-engineering things - a habit of mine which can get quite obsessive and unnecessary.