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The issue I had was mostly getting my braze to stick to the stainless tube. Using both thin high silver content bronze rods and sliver solder, as well as an array of flux' it just would not go. Ended up cleaning everything off and just using a bronze rod with the gas inline and it seemed to solve the problem.
Ph1ll1p
Hey. Good work on getting it done. Looks to me like you used some pretty chunky tubing for this? I might be wrong but I do wonder if that's why you were struggling. I use specific internal stainless steel tubing from Ceeway and find making internal routing extremely easy on both built and non built frames. There has been some good videos in my Instagram feed that shows the process. Both Saffron and Alex Meade did videos I think, where they just use a hand drill and an end mill (or some grinding die).
Maybe I can make a video of my process next time I do it. I've both done slots on a proper mill setup and cowboy style using a hand drill and I prefer the cowboy method to be honest.