TIP: Toggle Extenders ... It's easy to extend the length of a necklace that has a toggle clasp. Attach each end of a 3-in. (7.6cm) chain to each half of a second toggle clasp. (I use a clasp that matches the original necklace and attach the chain to the clasp with split rings.) To wear, insert the extender's bar end into the necklace's loop end and vice versa.