I've also used a little 3-in-one oil on small rusty areas that may rust again. Stops it dead. Once metal rusts in one spot, that's where it will come back, it's like cancer for metal. But like you guys said, keep an eye on it and see. I don't like painting whole chassis either. Good luck on a real beauty Bob 
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20
Pioneer SX-939, ER-420, SM-B201
Motorola SK77W-2Z tube console
McIntosh MC2205, C26
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