Pretty simple; I used a 4 foot section of 1/4" angle steel, clamped it in the vice nice and square and plumb. Then set up a couple steel angle plates (used for fence building or joist anchors) clamped square then a long threaded bar (left long to use for the head tube when the front triangle is set up) with a hole saw cut in half acting as the BB cup/holder. and a v-block to keep everything as square as possible. It helped to stay on track with Patereks manual without spending money and time of fixtures.
Here you see the head tube/ down tube fluxed and ready to braze in the fixture... the fixture head up very well to brazing and I set it up to be as open as possible.
I didn't take any pictures yet of the head tube/ down toube after brazing but I will tell you that was the hardest so far and I had to go back and dump more silver in it to make look better. But I got good penetration and it stayed pretty plum and square.
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