Abstract: An upper wedge having a T-groove therein is slideably connected to a lower wedge having a tee thereon forming opposing, adjacent surfaces. A slide support is integrally attached to the narrow end of the lower wedge. The support has a longitudinal aperture therethrough with an axis parallel to the opposing, adjacent surfaces. The upper wedge has a threaded opening having an axis parallel to the opposing surfaces. The aperture in the slide support is in registry with the threaded opening and retains a screw having a threaded end which engages the threaded opening of the upper wedge. The screw has a radial groove therein. The slide support has a first opening perpendicular and tangential to the aperture and a pin disposed in the first opening to engage the groove and retain the screw within the aperture. A second threaded opening perpendicularly intersecting the aperture and the first opening is also located in the support.