Deep Pits
for pits too deep for the steel wool to remove the 'CRUD' [looks like thick black paint under magnification] take a brass [important...not steel] pin/nail and keeping it sharp, put a drop of oil into the pit and then move the sharp pin/nail around removing the crud!..then wipe it clean and examine again. Active Rust will turn the oil red!
I use a 10X Loupe
You must remove that stuff or it will just keep 'eating away' at the steel!
Orv Reichert
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