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M_V
@PhilDAS
I'd probably use a grinder with a grinding disc, not a cutting disc, to take the bulk off but switch to files when getting close to the tube and I'd aim to get it flat rather than focus on removing all of the silver. Heat is quicker but you'll need to flux it and I CBA with the cleanup.
Putting heat into the frame should be minimised. Not just for alignment but also for the structure of the steel, making it brittle locally and can be a source of future cracks although it's very unlikely for a small spot like a braze on and if you use a fine torch flame with all the heat in the braze on as MV says.