I've been finding the rotating, upper spray arm on the top rack of the dishwasher after each cycle. I can pop it back in, but it seems very loose and the water pressure just blows it off again. I looked up the part and it shows a rubber gasket that connects to this spray arm, but it is unclear if it goes on the inside or on top of the dishwasher? I think it is either from that gasket missing, and/or the prong that pops it into the tops is too worn and and needs replacing. I would appreciate any advice as to where the gasket goes and what you think is the solution...Thanks!