I replaced an old MOEN water facet. This thing had a U-shaped stopper underneath and it took me about two hours to figure out how this thing could go. One Youtube video said I should remove the U thing that is holding it from below and to do so I had to work on the thing that is connected with the shower/spray device. It wasn't easy. The major challenge was that there were two nuts that were stopping the U-shaped thing to come off. One moved, but the other one was not 4-dimentional (8 I think) and I couldn't really turn it. I was working on this in a tiny little space and it took me a while.
Reference:
Removing kitchen faucet with a U shaped brace under the sink
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