It's also a very good idea to go to the hardware or auto parts store and get some blue (medium) thread lock compound (comes in a little squeeze tube or bottle). Generically known as Loc-Tite, but it doesn't have to be that brand. Just make sure it's the blue kind.
Use this stuff to keep the nut from loosening and causing your strap lock to fall off.
One of the beauties of the new EB straplocks is that even if the nut came completely off, your bass wouldn't fall.