Ender 5 Plus: Gap from nozzle to bed, can't level, screeching sound during z movement

I just finished assembling my new Ender 5 3d printer, but I can't level it.  No matter how I turn the leveling screws, I get at least 1-2mm of space between the bed and the nozzle.  Also, if I set all four screws to be about the same, there's a tilt of a couple of mm along the X axis.  Possibly related is the screeching noise I get as the bed travels vertically.

Help!  Thanks in advance.

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