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If I were to guess, step 6 may have somthing to do with nutralizing the flux after the brazing has been completed. Water should do the trick (if using an acid base flux) and if it is not removed, it could start to affect the metal of the blade thus making it weak and the braze insufficient.

This is of course a guess as I've never brazed a band saw blade before but I do have experience brazing other metals together such as brass. Just a thought.

Good Luck!
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