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@M_V
Also mitred the main top tube and brazed a reinforcement piece to the seattube end of it. Coffin shaped as per my first frame.
Top tube will get fillet brazed at the headtube end and silver soldered at the seattube (less heat = less distortion).
Just realised that if I want to do a similar reinforcement piece on the 2nd top tube then I’ll need to put it in place first as the reinforcement pieces wrap more than half way around the seattube and have to slide on from the top.
I won't bother with a reinforcing piece where the 2nd toptube will meet the downtube
The reinforcement pieces serve another purpose on this frame which is that the seattube is a 28.6mm od and the toptubes are 31.8mm. The reinforcement pieces step the od up to 31.8mm so there's no need to ovalise the top tubes. Since the downtube is also 31.8mm, I don't need to perform this function there.
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