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+1 on the plate glass. You can also tape down wet-or-dry paper, 320 or 400, and move the workpiece in a figure 8. Apply dye (felt tip marker works too) to the surface you're working; when the color is all gone, it's flat.
Yeah just call me boomer.
Manicure by old corroded MC partz mostly.
yes working a flange on a flat surface is a great way to go.
bbbBut nearly everyone has a file handy (finer is better)
Filing = just aluminum swarf, no abrasives sneaking into internal crevices.
A file also can be used on faces still in place on the bike, say the crankcase mating surface for the clutch cover. or a face with protruding features.
Nice big new abrasive stones with mineral spirits are often used on machine surfaces like a mill table to knock the edges off dings, get rid of rust. etc. Aluminum tends to plug up stones pretty quick.
Yet another method: Apply grinding past to the cover, place cover on crankcase, insert one screw and work back and forward, then shift the screw diagonally opposite and repeat, and so on.