Hi!

Okay I know what you are trying to do now... a rig to do motion blur on a slow exposure.

You really should be looking at the larger diameter tubes to get the level of stiffness you will need as you don't want it 'bouncing' at all. the 47.5mm roll-wrapped tube should be appropriate for this, to create detachable joints I would suggest using some short lengths of aluminium tube, either internal or externaly with pins through them to hold them together, I'm sure you could find a local engineering company who could make these for you very cheaply. If you did rig it with wires (like an arm on a crane) you could reduce the tube diameter greatly, but this could be more complicated to setup.

Paul Statham
Easy Composites / Carbon Mods - Technical