Drew,
Ours is slightly different again as we use an endless halyard which returns to the fitting attached to the sail. Simply pull it up and when it is at the top the other end of the halyard is pulled back down, hey presto, locked.....to unlock simply pull up a bit and it releases.
Happy to send you a pic. and the advantage is no halyard to tuck away.

David
Salpicon de Resplandor, 1744