This clasp doesn't have a safety catch (I think it broke off..from the hole). Anyone have experience with clasps coming apart? Do you think I can still use it on less expensive vintage pearls? My mother told me that "pearls have a safety catch so toddlers won't ruin your necklace." I realize how silly that phrase is now...but I don't understand how pearl necklaces got safety clasps and I want an opinion on using this before I use it.