First soak the rusted part in penetrating oil, such as Kroil, for a few hours, and with it still wet with the oil, gently rub with some "copper" wool. I've been told a Chore Boy scrub pad works, but I have not used one myself. You may need to repeat this several times, depending on the amount of the rust. Do not rub too hard, as you can remove the bluing.
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H Richard
SWCA1967 SWHF244
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