Here's a piece I recently did on a retrievable re-direct / anchor concept I've been experimenting with. It simply combines a few tools that I always have on my saddle to form a retrievable redirect that works off an initial basal anchored climbing line.
Ingredients: Sterling chain reactor daisy chain, rock exotica pirate carabiner, dmm pinto pulley (with carabiner) and a third carabiner used for spiking in when the anchor is set up in a static configuration.