Not a bad start. Have you brazed before? I would start with tight fitting tubes so you can cut them up to verify penetration. I’m just starting to learn brazing myself and I’m local to you. Let me know if you want to connect and chat bike/welding stuff.
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I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC