This Old House plumbing and heating expert Richard Trethewey outfits an old standalone tub with a new showerhead. (See below for a shopping list and tools.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Shopping List for How to Add a Shower to a Claw-Foot Tub: - tub-and-shower assembly, with tub spout, handheld shower and showerhead -…