Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

 
           I use a brake cable from a bicycle for tight bends. But you have to put a drop of super glue on the end to stop the strands unravelling. It is good for 2 or 3 bends in different directions in one piece of tube. I just pull it out past the first bend, then make the next bend etc.

                                                       Chris.