i just got some ernieball slinkys and i just tried to put them on my stingray5. but when i put them in the tuning keys in that little hole and start to tune the string, it starts to slip out of the hole it starts to get get tight and near the note it is suppose to be, it pops out. i have tried around 10 times. everytime it pops out. what kind i do to keep the string on my bass??