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OT I am now playing the role of a plumber who is trying to replace part of my sink on the top with a new part in the middle t

OT I am now playing the role of a plumber who is trying to replace part of my sink on the top with a new part in the middle to replace the old one but now how do I go about getting the middle part taken out so I can replace it with the new one. I managed to turn the water off which is a good thing.