agree, bottom of inner pick-ups.
make sure you are using the centre of the laser beam..
I prefer to use fishermans braided line, it doesnt stretch like cat-gut and a laser can be fiddly at times if you are doing it on your own...
Make sure the floor is pefectly level ( or atleast in left and right) when using plumb bobs otherwise the reference line wont be at the centre of the car.
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