primary(front most shoe) wearing into drum face...

[Fast68Chevy]

ok, who thinks they may know cause of the metal backing of a primary shoe wearing a groove into the outside diameter of the inside drum face flange,,,, ?

been scraping and grinding and i finally got one drum pried off and i found this condition.. the shoes arent really worn out either, need adjusted probably though, but still... its like the bottom of the front most shoe is out away from the backing plate too far.

ideas ?

thanks

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-71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!still building it-
-'84 Z28(Z28) 1G1AP87GXEL100000 with H.O. 305/4bbl/190net/hp(L69) 3.73 rear(GT4/YC4) 700R4(MD8-MXO) & other goodies
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Randy- Lincoln, IL

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