Better still, take the pads out, align the caliper over the rotor by eyeballing it, put the pads back in
This is the way. The 'squeeze the lever and tighten back up' works OK if your pistons are equally loose, but one slightly stickier piston will throw it off and you'll be in rub city.
@TooTallTim started
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Better still, take the pads out, align the caliper over the rotor by eyeballing it, put the pads back in