IMO, These small Cragar 7/16" lugs/washers were a PITA even 35 years ago. Just not enough clamp surface. They loosened up too easily even when torqued correctly.
It doesn't take long for the "built in" washer on the nut to dig into the flat washers they supplied. So that indent in the washer X 5 is what's doing the work on the wheel. Lol, Over time after repeated re-torque, ya' started working on the hex too.
Was more than happy to swap to 4-1/2" BC discs with the 1/2"-20 lugs.
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