Product review (4 stars): Frigidaire 154754502 Upper Spray Arm Assembly for Dish Washer
This spray arm gave me a little trouble screwing it on. The old one came off and on very easily, several times. The new one felt like it was cross threaded. I was very careful and even inspected the threads and did not see any damaged threads. I finally had to apply extra extra upward pressure while trying to start the threads but that caused the fitting to move up and become flush with the top of the dishwasher. I had to hold it down by slipping and old metal door sweep into the space above the counter and the dishwasher. Then I was able to get the spray arm installed. The other option would have been to pull out the dishwasher.