[MrForbes]

Are you going to run a screw through a piece of tubing, in a such a way that it could collapse the tubing? or will there be a spacer in it? or are you going to drill a larger hole through one side for access to the screw head, and have the screw only go thru one side of the tube?

I'd need more info before being able to answer the question, or suggest other ways of building it.