Ask This Old House general contractor Tom Silva is in Salem, MA, to help install a bookshelf that doubles as a door. (See below for a shopping list, tools, and steps.) SUBSCRIBE to This Old House: http://bit.ly/SubscribeThisOldHouse Shopping List for How to Install a Hidden Door/Bookshelf: - Scrap piece of 1x4 poplar wood [https://amzn.to/2Fpkded] -…