Hi to everybody. I'm going to update my 4ctw studs to 6ctw. But I have concern about locks. My jeweler telling me that only classic backs will balance studs and they won't fall down. But I prefer La Pousette/Protector/Spring locks. Does someone has experience with this sizes of studs? What was the solution? Should I try to find another jeweler, to convince mine or just make the new studs with classic locks and to buy Chrysmela lock on eBay?