Clifton H Hope Mills , NC June 17, 2014 Appliance: Whirlpool Undercounter Dishwasher WDF510PAYB2 Whirlpool Dishwasher Wdf510payb2 / : The lower arm spray bar was damaged. How to replace Lower Spray Arm. Removed the damaged part and replaced it with the new one. It just snaps in place no tools required. 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes