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yetidamo
@fizzy.bleach
Because I'm a saddo who reads about aluminium heat treating before 6am, I can't find an immediate reason why heat treating the frame again would be a bad idea. I'm also not 100% sure that it would be necessary for an additional cable guide (if I understand the task correctly).
The weld (AIUI) will be weaker than the rest of the aluminium, but I don't know that a cable guide would need to be structurally strong, and some aluminium frames were never heat treated anyway.
Given the cost and complexity of heat treatment (which involves controlled quenching and pretty quick realignment of the frame due to the deformity it creates,) I wonder how many small scale custom aluminium frames are heat treated at all...
But I'm not a materials scientist or even a man who knows what he's on about.