Thanks for this, super helpful! I also found a few videos on youtube and you saved me I don't know how much time trying to figure out what replacement part to purchase.That’s a Delta 1400.
The cartridge nut is here.
View attachment 33815
Use a rubber jar opener or rubber gloves to grip it with just your hands.
If you use channelocks be sure not to squeeze but rather grip and turn.
Sometimes they must be cut off
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