Lower Wash Arm Problems

[SIZE=3]My dishes have been comming out with a film covering them leaving me to conclude they are not being rinsed in the final cycle ? I checked the lower wash arm and found it to be VERY loose in all directions with a lot of play in it. I replaced the upper radial bearing (PT8762157) and the lower bearing (PT9134553) but the arm STILL has lots of play in it. With the restrainer nut tightened down all the way the wash arm still has some upward play in it. Is the wash arm supposed to have this much play or have all the other components been worn and need to be replaced like the retainer nut (PT134478), lower wash arm assembly (PT8762148) and outlet (PT11892273) ? Please let me know BEFORE I spend my limited cash. Thanks.[/SIZE]