Husqvarna 400234 Top Lock Flange Nut, 9/16-inch For Husqvarna/Poulan/Roper/Craftsman/Weed Eater
Husqvarna, Poulan, Poulan Pro, Roper, Sears/Craftsman, and Weed Eater 400234 Top Lock Flange Nut, 9/16-inch.  Current part number 400234 replaces previous part number 178342.