well i have to say it actually not quite as simple as making them dead square,
it depends on what characteristics you would like the car to have.
At the rear of a car:
A small amount of toe in will increase straight line/high speed stability at the cost of a small amount of tyre scrub.
A small amount of toe out will increase oversteer in the corners especially when power is applied
neutral toe is somewhere in the middle the main benefit being no tyre scrub however i would recommend a very slight toe in for the benefits of car stability.
as for how to adjust it just shim the bearing blocks off the upright, mines done like that and has been fine.
hope this helps
tilly
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