Most two- and three-door pocket doors include a recessed floor track. Johnson’s Sliding Multi-Pass and By-Pass Pocket Door Hardware replaces that with J-shaped guides that fasten to one door’s side and fit in a channel in the adjacent door’s bottom, locking them together. Overhead tracks support doors up to 200 pounds. Hardware for the doors shown should cost about $150. LE Johnson Products, 800.837.5664, johnsonhardware.com