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Swing-Arm Desk Lamp M5 Wing Tension Knob
A 52 mm bow-tie wing knob that replaces a lost or cracked tension knob on swing-arm and architect desk lamps that clamp their joints with an M5 bolt. A standard M5 hex nut (8 mm across flats) presses into an 8.2 mm pocket in the base and sits flush with the joint face, so the knob needs only about 4 mm of bolt sticking out. A 5.5 mm clearance bore runs all the way through, so longer bolts also fit.
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