Patent ID: 8066461

Claim:
A device comprising: a screw with a screw head, a first threaded portion, a second threaded portion, and a central axis, the first threaded portion nearer to the screw head along the central axis and having a first pitch and the second threaded portion farther from the screw head along the central axis and having a second pitch; a nut including interior threads corresponding to the first threaded portion, the nut positioned around the central axis of the screw; a housing having a first opening that exposes the screw head while retaining the screw head within an interior of the housing, and the housing having a second opening through which the second threaded portion can extend, the interior of the housing rotationally retaining the nut and providing a translational stop for the nut that prevents the nut from traveling closer than a predetermined distance toward the first opening when the first threaded portion engages the nut; and a spring that biases the screw toward the first opening of the housing.