Abstract: A well barrier can include an annular seal element, an anti-extrusion backup having radially inward and radially outward portions, and a biasing device that exerts a biasing force against the radially outward portion of the anti-extrusion backup. A method of operating a well barrier can include setting the well barrier by decreasing a longitudinal distance between abutments of the well barrier, thereby compressing a seal element between the abutments, and unsetting the well barrier by increasing the longitudinal distance between the abutments and radially inwardly retracting an anti-extrusion backup positioned longitudinally between the seal element and one of the abutments. Another well barrier can include an annular seal element, an anti-extrusion backup, an abutment displaceable relative to the seal element to compress the seal element, a sleeve reciprocable relative to the abutment, and a biasing device that biases the sleeve toward the anti-extrusion backup.

Abstract: A jig assembly is used to manufacture shipping crates essentially functioning to prevent damage to crate-bound material. The jig assembly includes a jig form and magnets. The jig form has a front portion, a rear portion, and a top portion extending between and connecting the front and rear portions. The front portion is parallel to the rear portion such that the front, rear, and top portions together define a board-receiving channel. The front portion has a pair of fastener-aligning slots and a pair of magnet-positioning bores for receiving and positioning the magnets. Fasteners are positioned by the slots and magnets. The board-receiving channel receives a first board of a crate assembly. The properly aligned fasteners may then be driven through the first board into a second board of the crate assembly so as to prevent damage to the crate-bound material. Certain jigging methodology is further supported by the jig assembly.