I used to do Andy's procedure. Lately I've started noting which side rubs after initial lever squeeze centering, and putting a feeler gauge between rotor and pad on that side after loosening both fasteners. Start with a 0.010", and squeeze lever and snug both fasteners. Remove guage and test. Use larger or smaller size if first try doesn't work. With either approach, squeeze the lever a few times before you put the tools away, as you may think you're done, but sometimes you're not done.