[SAJ]

I adjusted my toe in with a home-made trammel to 1/16th inch. Then took it to a laser alignment place who do the clubs Model A's and my alignment was perfect. They also checked front to rear alignment, castor and camber etc.
I cannot see how toe in can be wrong if done carefuly by measurement, as long as the weight is on the wheels, the car is pushed forwards to bring the same measurement point on the wheels from front to the rear and the height at which the measurement is made is correct according to the Ford method.
My wife's Tudor was set by a laser machine after an accident repair. When I got it back I measured and found 1/8th toe in. I changed it to 1/16 using my trammel.
Both cars have radial tyres and steer nicely.
Can someone offer an explanation of how the two methods of measurement can differ if both are carried out correctly. The laser method obviously can measure smaller increments due to the magnification the beam gives, but 1/ 32nd accuracy is easily seen by eye on a trammel.
SAJ in NZ