A mechanism is provided for an office chair to adjust the tilt of the seat portion relative to the base of the chair. The mechanism includes an adjustable member tiltably mounted on a base, a compression spring bearing on the adjustable member and connected to the base using a retaining bolt running through the center of the compression spring, and a clutch device fixably attached to the base extending to the adjustable member, which clutch device is capable of holding the adjustable member in a fixed position relative to the base.
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