Non self adjusting rear drum brakes on a Dart?

The shoes are adjusted by rotating 2 bolts on the back side, one for each shoe, the pins move the shoes on an eccentric base.
I am not sure why the left side is not holding as much as the right, they are adjusted the same.. it seems that adjustment of parking brakes cable can also have some influence in that aspect. Anyway, too old for a 1976 with front disk brakes.

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