belowzero

I'm a newbie and was reading the threads on this, not sure if you have sorted it out or not but i'll chip in. I just wondered how they machined the discs for you and what run out they recorded?, was they taken to an engineering shop or were they machined in a car repair garage ?. The reason i ask is that, when we used to "re skim " brake discs, the the machining was done in one go, that is to say both faces were skimmed without turning the disc around in in a lathe chuck. This prevents or reduces error to a minimum, any amount of run out either side will be amplified by the road speed, a thou on one side and on the other side not opposite to it will be felt through the steering when braking .