Michael R Bowling Green , KY January 06, 2015 Appliance: Whirlpool Undercounter Dishwasher WDF310PLAB0 Whirlpool Dishwasher Wdf310plab0 / : The upper spray arm on my dishwasher broke. How to replace Dishwasher Middle Spray Arm. I ordered the new arm and it arrived the next day, it was the easiest fix ever you just align the holes in the arm to the pegs on the basket and twist till it cliks and done works like it never happened Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes