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Yes. It was an easy way to hold the head tube in place while tagging it. I am only suggesting this to Sven though, as he seems capable.
There is of course some filing required. But you get mitres from an online generator based on tube sizes and angle. Then you cut and file until headtube is straight and in the preferred angle. That is where patience comes in
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I really liked all of your headtube conversions, if I ever run in a crushed headtube 90ties steel for cheap, I will be asking for a lot more info. I can get stuff brazed for cheap back at home in Croatia, so a donor frame would kick this off. What´s the best way to approach the brazing of a disk tab at a fairly standard rear triangle (i.e. position, reinforcement, homemade jig..)?
This may be a dim question, so I apologise. Is the "string method" simply holding the tube to be welded in place instead of using a jig? If so neat idea, although its still a bit of a job to remove the head tube and mitre (if that is the correct word) the cut joints to fit the new tube.