Oh, Strange, where would you be without her? Are you not also from Thalassa, city of sailors and their knots?

"I suppose you could also tie a leather cord around the spot in the chain you want it tightened to after making a slipknot loop, in case you want to easily let the chain out again." She's had knots in necklace chains before and they're terribly hard to get back out unless you can pry a needle in there.