Abstract: Apparatus is provided for controlling and quickly releasing pressure of a tool on a workpiece. In a preferred and specific embodiment, the apparatus is employed to hold a glass cutter and to control the pressure of a cutting wheel of the cutter on a workpiece. The apparatus includes means forming a flat supporting surface for the workpiece with a mounting stand affixed to the surface-forming means. An elongate tool-supporting arm is affixed to the stand and extends over the surface and has a tool clamp at the outer end for holding a commercially-available glass cutting tool, with the cutting end extending downwardly. The elongate supporting arm is pivotally connected to the stand and an adjusting member extends between the stand and the supporting arm and engages the supporting arm between the pivotal connection and the tool clamp. This can be adjusted by the operator to infinitely control the pressure of the tool on the workpiece supported on the flat surface.