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I had the same issue when I did the brakes on my '57 356A. I got them reasonably close using an air die grinder and 3M grinding wheels, using a mist of rattle-can paint as a guide coat; the chalk would probably work better.
I also roughed up the drum surface with 40-grit sandpaper. Brakes are nice and smooth now.
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"You go to the track with the Porsche you have, not the Porsche you wish you had."
'03 E46 M3
'57 356A
Various VWs
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