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In the photo, it looks like the splines are not in the same location; maybe insufficient engagement?
Is it possible that the LH studs have been replaced before and the splines are worn/enlarged?
I'd spend some time with the wheel stud catalog at the local NAPA.



Thanks, the one in the middle is the problem stud. The spline runs the length of the shank. The new one was a good fit in the rear.