I'm looking into having a 2ctw set of studs placed into a different setting with this type of backing. My question is, does the backing slide past the notch and stay in place(closer to the ear) or must it stay in one of the 2 notches? My problem is that my earlobes are very thin and I usually have to push the backs in very tight. Also, about how wide in diameter are the pousette backs? Thanks in advance!