That looseness will not be apparent once the strings are tensioned. IDK why one is not loose. Maybe the small screw that holds the button on is too tight - but I am not sure of the mechanics right there. While strings are off, or when installing new tuners, you might wind each tuning post around and back a time or two. That may help distribute grease in there. The nuts you snugged up are nuts; they thread onto the collar that surrounds the turning shaft that holds the string. Before tightening them, I turn each machine so it's snug against the hole. There's a little play there. Machines on the right side of the headstock can rotate a bit counterclockwise; on the left, clockwise. (Same direction the tensioned strings will pull on their machines.) Snug the nuts, then snug the small screw on the back side of the headstock.
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