Oklacarcollecto said

I have never seen that on a 10 inch a body drum and I have used NOS Mopar drums recently. I can't recall seeing it on any new drum. I think it would be pretty hard to turn leaving the raise in the drum. Every machine I have seen turns the drum equally all the way across. If memory serves me correct I recall seeing some brake shoes with a groove near the center of the lining. If I am recalling right this would wear the pattern in the drum over time.

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