Answer Helen, The lower spray arm assembly is a "snap in" fitting Plce the spray arm assembly into the spray arm base WD12X10244 and press down on the spray arm assembly until you hear or feel the retainer clip snap over the ridge in the spray arm. You may want to check the spray arm base, to make sure the retainer clip is not broken. Read More... Answered by AppliancePartsPros.com | Saturday, December 22, 2012