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Im gonna preface this with i am not an engineer and have built 15 frames so no expert builder either.
I think that chunking a big ass lump out of the chainstays like that has to be done really well. I know people do it with success, but in general i think it has a good chance of not lasting that long. If you braze the bond area is very small, little to no area for reinforcement.
Tigging is IMO a better option, especially if you purge it, but you still have to do it effectively. Hard to get good pen without burning through.However...I know people do it and it lasts, so it all depends
Biggles567
In general or specifically to retro-fit to a finished frame?