so i have the caliper off and compressing the piston with the clamp using the old brake pad, same way ive been doing it since i was like 14.

i put the pads on the holder thats on the rotor, anti rattle clips look good.

i take the caliper (now fully compressed) and slide it back on and proceed to bolt it up. now i know the two bolts have the little o ring gaskets. i know i have just compressed the pistons but why in the hell am i tightening and tightening and nothing is really happening? the whole god damn rotor is still lose. i realize it wont be as tight as when i pump the brakes when its all said and done but have i missed something here???