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I wouldn't have thought it should be possible to turn the nut half a turn in each direction. The nut tightens the top of the strut shaft to the inner metal part of the strut mount. This is bonded to a round 'doughnut' shaped piece of rubber which is bonded to the metal mount that actually bolts to the car. A mounting in good condition is very stiff and resists rotation. Rubber on rubber or rubber on metal sound would point me to a mounting that has perished/split rubber or rubber that is starting to part company with the metal. I replaced mine at 18yrs/68000 miles. They weren't making a noise but they were starting to show these problems. Try pushing down on the car whilst looking at the nut - if it moves upwards noticeably I'd also question the condition of the strut mount.
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