I can support what David wrote above, it's definitely not easy to make a good carbon tube from scratch at home without a vacuum pump setup and an enormous oven to cure pre-preg carbon fabric!
For a project to re-rig my dinghy I bought a 5m carbon tube in NL () to form the mast, but I made a 1.5m tube of my own to reinforce the base from inside. It worked out well but for sure it was messy and could have gone wrong. What is really important is that the mast has fibres oriented both diagonally and horizontal/vertical.
However, on his YouTube feed, Yann Quenet seems to have found a good solution. I've twice tried to obtain the details, but it looks like he's using a pre-preg twill and then applying epoxy on top - presumably the hardener in the resin is also triggering the pre-preg to cure at room temperature. I'm keen to know!?
But what Yann and I both independently did the same was to use PVC drain pipe as the mandrel, and being cheap we both left it permanently inside the carbon tube:-)
The professional method is to coat the mandrel with an easy-release fluid which should allow the mandel to be removed without a tractor;-)
Finally, Mike Waters has developed a process for making long and complex carbon masts without vacuum bagging. He sells the plans including the method, but perhaps he'd be willing to sell the method itself, without the full plans, to make a simple round mast instead of the complex profile for his wing mast???
Hope this post is helpful!
