Product review (5 stars): Improvement over the original part
I ordered this part to replace the original my dishwasher.  We had inadvertently place an item in the top rack that was too tall, and the spray arm hit it finally snapped out of place.  We were able to snap the spray arm back into place, but after a few more runs, the spray arm came off again.  Soon, we were having to reattach the spray arm after every load.

Upon receiving this replacement, I discovered that it had been redesigned, an it is a far superior design, much less susceptible to the failure of the original part.  Very pleased!

I did have the same problem on the previous review with getting the new part screwed on.  I have smaller fingers, so what I did was detach the spray arm from the "nut", put by finger through tht nut, then up into the water tube to pull it down in place.  With my other hand, I was able to apply opposing upward force to get the threads started.  It did require a lot of patience and several attempts to get this to work.  It will screw on just fine once you get it started, however.  Take a deep breath, and keep trying.  :) Once you get the nut screwed on, tighten it, then snap the spray arm into place.  The new design does not require you to take the nut off to reattach it, like the original assembly did.