As work continues on the Carlisle, Mass., farmstead there are concerns about the oak lintel above the fireplace. Also: dining room furniture and fabrics; cabinets for the kitchen, office and pantry; library built-ins; working with high-density polyurethanes. On “Ask This Old House,” projects include installing a 220-volt receptacle in a garage woodshop and a macerating toilet in a basement. Also: a primer on residential electrical service panels; gardening hand tools.