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Shower Arm Pinch-Collar Head Droop Jack
A pinch collar that clamps a standard 1/2 in IPS shower arm (21.3 mm OD) just behind the showerhead nut. A screw in the arm's 30 mm jack beam pushes on the back of the head, so a ball joint whose retaining collar has cracked or scaled up can't droop anymore. It clamps with an M3 bolt and captured nut, and the jack is an M4 self-tapping screw in one of three bores set 24, 30 or 36 mm from the arm axis so it suits different head sizes.
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