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How to solder on hinges: used 2.5mm OD heavy walled tubing. Make sure your edges are FLAT. UPDATE: One thing that was brought to my attention that should be changed: make your center hinge longer and the outer top and bottom hinges about 1/4-1/5 the size of the middle one. The center hinge needs to support most of the weight and it is more prone to twisting on you! (Courtesy Brad Smith!)