look it up on youtube

iLemon_iX wrote If they don't register,
then the spring is not on the good place.
Open it and put it good =D

what springs u dik there are no springs on the bumper buttons rb an lb are easy to fix but depends whats up with them ive had a few that the push button inside has gone fualty an ive had to desolder an replace them but 9 times out of ten a good clean works replaceing the plastic bumpers are easy to do but if its the actual button inside the pad its a little harder unless ur shit hot with a solder iron i would not even bother

off topic= ilemon just so u no the spring dose nothing apart from return the trigga to its op so it would still work but not return at all or fully if u get what i mean but this has no relivence here as we are talkin\g about the bumpers not the trigga