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Office Chair Tilt Tension Knob Retrofit
A 66 mm scalloped replacement for the cracked tilt-tension knob under an office chair. It is 28 mm tall with a 12.5 mm through-bore and three radial M4 set screws in brass heat-set inserts, so it clamps onto the old threaded stem or a stub of rod anywhere from about 8 to 12 mm. You don't need to know the chair's exact thread.
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