I've tried several methods...tape measure...the flimsy thingy that JCWhitney sells...but since you are dealing with very close measurements...nothing much works very well. You are talking 1/16" or so.
Was having my car aligned and the guy mentioned someone who used a laser to do his toe and he got it right on...thought about it and found a method.
Most vehicles have the frame of the car below the axle center...making using a tape pretty hard to do...tires treads are not that accurate...and even if you can manage it...you need help.
IMO...using a laser can give results comparable to an alignment machine...if you watch what you are doing.
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Leading the perpetually ignorant and uninformed into the light of scientific knowledge. Did I really say that?
 a new policy....I intend to ignore the nescient...a waste of time and energy.
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