Described herein are methods for identifying compounds useful for producing heavy oil from an underground reservoir. Reduced pressure is applied to at least one fluid, such as the liquid. The body includes a first aperture for receiving a tool, and the first aperture includes slots to accept a plurality of sizes of tools. The interlocking of the components at each corner provides a stiff and sturdy perimeter frame when assembled, that becomes more rigid as loaded with plant propagation trays, fish tanks, or other heavy items than require level secure support. Preferably, the jaw is biased outwardly from the tool housing to a casing-engaging position by a torsional member, housed along the axis of the hinge of the jaw.