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Hi my name is ***** ***** I have been in the plumbing field for 20 years I will be glad to help you today. Bear with me, I am typing out the answer now.
So the reason for the screeching is a little bit of an installation issue. There is the handles and bonnets and the rough valve bodies or stems. First the valve stems are installed. They have a nut and washer on the bottom and nut and washer on the top. The height of the valve stem is adjustable to accommodate different counter top thicknesses. The height of the valve stem is a little low so the bonnet of the handle is scraping against the base plate of the handle. Hold the handle and turn the base of the handle to unscrew it from the valve stem. Once you remove this then loosen the nut underneath the valve stem under the cabinet and then tighten the top nut to make the stem a little taller. I am not sure about the measurement but I think it has to be 2 1/8" tall. That is from the counter top to the top of the stem.
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