Finally got back to working on the truck. New brake shoes, hardware and brake cylinder installed with a Speed Bleeder. Now time to put the axle back together. More newbie axle questions! Anything I need to worry about in the picture above? The darker rusty spots near the bottom of the shaft just before it flares out to the plate are what concern me most. Should I try to remove all markings with light sand paper? Scotch brite?