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The hardness of each part have to be different due to a myriad of variables
A couple are:
Size of the part(this includes cross sectional thickness, not just size of the working area)
The dynamic in which the bearing surface is worked in relation to the other work surface.(one work surface usually does more work than the other)
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Aaron.  F.S. 1965 Solex engine w carbs/cleaner
Burnham Performance
https://www.instagram.com/burnhamperformance/
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