usually camber screw is used when the car has aged,where the lower arm,knuckle,absorbers especially has run outa specs causing negative camber angles causing the tire position maybe more than 0degrees which will cause premature tyre wear in the inside in most cases,its a good item if u wana maintain ur tyre 4 along time,the cons is that this screw is quite fragile and nt robust as the standard steel kingpin,which makes safety a question.certain cars is unable to adjust camber so this screw is helpful bt most car manufactures do not allow camber adjustment.Most proton cars and perodua do nt have camber adjustment for the front wheels.

aged??
r u sure??
my dad's honda car already goin 20yrs old by next year n yet neva put any camber nuts~
even my satria n my  sis's wira  goin 13yrs old n still neva put camber nuts also cuz in my shop me n my dad wit his bro n cousin do d proper way of alignment adjust by d rack end there~
as for me i can tell u camber nut is used majority for accident car n if u wanna adjust more camber for stabilty~
every car has camber setting ard -0.2 to -0.7
if u jus let tire shop con u by changing in2 camber nuts n set it  0 degree meaning they take away ur car's stability which will harm user on da road wit sum car actually skidded on da road due 2 d stabilty of tat car no longer exist plus without camber or 0 degree setting will make ur car feels floats during high speed at 80-100km/h n above~
many shops will ask u change in2 camber nuts cuz for 1 main reason which is 2 get more commission cuz normal alignment won't cost u more than rm40 for perodua n proton cars as their salary is depending on commission n their basis salary is ard 1.5k per month~
so other wat i've explain up n above so do u mind 2 explain more 2 me y do v need 2 change camber nuts??