Cam bolts are on the lower control arm pivots, they allow defined movement to
align the strut.
Likely the bushings are worn, the bolts usually are not (although it can
happen), and you get the result you have, not enough adjustment.
Also possible that the ball joint(s) are worn, although that is usually pretty
obvious. Could also be a bad upper strut mount, or an incorrectly installed
upper mount -- on some applications they can be "backwards" front to rear.
You also probably have slightly loose bushings. This will result in excessive
tire wear and noise.
Proper cure is to replace the worn parts -- depending on the design, this could
be worn or deformed bushings, worn cam bolts, or a worn ball joint.
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