Can anyone tell me the wall thickness of the original bundy tube?
Most tube now is classed as dual wall and is 0.70mm thick which I am sure is much thinner than original
Given the inevitable rust issues I want to build in a decent life.

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Mk1 Cooper S
Mini K Rally car

Hello crisonic 0.7 would be ok as they don't rust from the inside ,the outside will last for years, and longer if you paint them with cold gal or epoxy silver or epoxy clear which mine are They are not easy to make , I have made them and if I ever had to make them again I would make them in 2 sections ,flange joint and silver solder or slide on small section of copper tube then silver solder the joint ,you will have to cut the copper and open it up slightly for a neat fit.Also there is a brake place at Parramatta that makes them I cant recall the name Good Luck When I have bent them I have made them fit better than new, Bugger of a job to do, I would rather go shopping with my wife, Also they are double flanged so you need the correct flanging tool.
Allen

Have just measured an original pipe wall thickness at about 0.82mm. Measurement taken just inside the end of the pipe and past the section where the tail nut picks up the flare - admittedly a bit dodgy but wasn't going to cut the pipe open to find a clean section to measure!

Agree with p7676 comments about the difference not being an issue. Agree about it being a 'bugger' of a job, too. Could make them in 2 sections and have a flared union joint in the middle. I seem to get the 2 end sections pretty close to fitting but the bit in the middle is always wrong and pushes one end out of alignment.

For a longer life, there is stainless bundy tubing available but I think that is for masochists, and not really suited to DIY pedants.

Thank you both for some constructive comments. The idea of painting them in 2 pack is the way I will go. I have done them before and understand what a rotten job it is. Stainless steel just adds to the bending difficulties. I didnt want to cut what I have to check wall thickness. I thought it was closer to 1mm The last lot I made was for a rally rep and I ran the tube inside the car with 2 joiners in each. That made it really easy. So this time its one piece at 0.7mm wall. Thanks again

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Mk1 Cooper S
Mini K Rally car

When I restored my existing hydro pipes I finished with cold gal in a spray can so as to look close to original. Probably cheaper and easier than 2 pack.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43