Product review (5 stars): Easy if you know what you're doing
I found this extremely difficult to put together but only because I had no idea what the black O ring was for or where it went. It's not mentioned in the instructions that were included and I know nothing about dishwasher parts-I'll admit, I'm slightly less than smart when it comes to this stuff. I googled and found nothing helpful. Once I figured it out though, it was so easy and fixed my dishwasher!

So, here's my instructions on how to put it together that some may find helpful.

Step 1: Push down the collar and expose the retaining ring (the metal C looking ring)

Step 2: Remove the retaining ring. Then remove the collar.

Step 3: Remove the spring.

Step 4: Remove the 4 slides. (plastic, white teeth)

Step 5: Remove the O-ring/rubber gasket which is located inside the nozzle, under where the slides were. (I had to feel around for it and use good lighting to find it.)

Step 6: Insert new O-ring/rubber gasket by sliding down into the hole of the nozzle. It won't work if you pinch it and try to place it in, it needs to be slid down.

Step 7: Carefully insert new slides. (I can't tell you how many times these fell out and I lost them. So be careful!)

Step 8: Put new spring on.

Step 9: Slide new collar on.

Step 10: Put new retainer ring on.

You're done! And now your dishwasher works! Huzzah :D