Okay, so let me get this right, you take your suspension apart, remove an item, refit a different item and rebuild everything and people think that they are going to get everything back in EXACTLY the same place to within a 60th of a degree without use of some kind of alignment device.

Sorry, but it is not possible.

Yes, on a general, bog-standard car with a tolerance of +/- 1 degree, it would be within tolerance to just remove and refit a component, but as soon as you alter something (like putting a lowering spring kit on), you are significantly altering the suspension and steering geometry. Now, take into account the different initial camber angle you will be set @. On a 30mm drop, this could increase the camber by about 1-1.5 degrees. This would mean an alteration to the toe to compensate for any difference of toe-out in turn, or even for normal driving.

Sorry if this does not sound clear, but as it is late on a Friday night, I may edit later to sound clearer.