Wheels where removed. When I put the wheels back on the lug nuts grabbed the dip on the mating surface and started to pull the dip from the socket. I used a razor knife to cut the lug nuts loose and repaired the dip. When I did the second side I removed the dip and install was very simple. One other thing I did was keep a rag handy and every couple of sprays I would wipe the tip off to stop it from clogging up.