Put the charm aside for now, and grab some chain. Cut two pieces about 6 inches long. They don’t have to be exactly the same amount of links, nor do they have to be exactly 6 inches. So long as you’re in the ballpark, it should be fine. If they are a little mismatched, it will only add to the haphazard effect of pulling the guts out of a grandfather clock and deciding to wear the pendulum around your neck—because Steampunk makes sense.