Abstract: Disclosed is a drill rig having two master skids. Wherein prior to assembly of the drill rig, the master skids include a base box structure and a supported box structure arranged in a nested relationship. Additionally, the base box structures house hydraulic components and support components necessary to raise and support the supported box structure at an operational position. Further, the base box structures includes hydraulic components necessary to raise the drill rig mast to an operational position.

Abstract: A drum for winding a cable attached to an overhead door includes a hub having a central aperture for accepting a shaft, a radially extending boss formed on the hub and a threaded aperture extending through the boss for retaining a threaded fastener for releasably attaching the hub to a shaft extending through the central aperture, a web attached in a central portion of the hub, the web extending radially outwardly at an angle of approximately 60.degree. with respect to the longitudinal axis of the hub, and a cable support extending about and being attached to the web, the cable support having a multiturn generally helical cable winding groove formed in an outer surface thereof.

Abstract: An apparatus for counterbalancing an overhead door includes a spring anchor assembly adapted to be connected between one end of a torsion spring and a wall of a building at an overhead door opening and a spring winding assembly adapted to be connected between the opposite end of a torsion spring and a shaft rotatably mounted on the wall and coaxial with the spring. The shaft carries a pair of winding drums attached by cables to the bottom of an overhead door. Both the spring anchor assembly and the spring winding assembly have spring attachment means which are adjustable to accommodate different diameters of torsion springs and compensate for the helical form of the spring.