On a small area like that consider starting with a small well oiled tuft of fine 0000 bronze wool (you can get it from most hardware stores) on the tip of a wooden shaft Q-Tip. Use a circular motion. This should let you get loose red oxide off the surface. You can then follow it with a similar small well oiled tuft of steel wool which is harder. Be more conservative about using the steel wool. Use a well lit work area so that you can see into the finish and closely observe what your actions are doing.
This should not impact the bluing that is present on the finish in that area. This may alter the area that has lost it's finish. The safety lever should have been strawed, and that finish may be affected differently than rust blued or fire blued metal. In addition, with aging, the straw's surface finish can shift to other types of oxide.
It would help if you could post a picture.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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