The described embodiments relate generally to methods of assembly of electronic devices. In particular, a rotationally induced pressure is used to activate a securing mechanism positioned between a component and an enclosure. The component and the securing mechanism may be located in an inaccessible region of the enclosure such that traditional, direct, assembly processes may not be feasible. The securing mechanism may take the form of a layer of pressure sensitive adhesive or a fastener between the component and an interior surface of the enclosure.

An assembly for use in refining metals includes two adjacent capping board segments defining a joint interface there-between, a contact bar that may be a contact bar segment and is sized and configured to lay on the two capping boards and to span across the joint interface, and two engagement mechanisms provided on respective sides of the joint interface, to hold the capping board segments together. Each engagement mechanism may include a projecting anchor element and a retaining cavity sized and configured to receive a corresponding projecting anchor element. The contact bar may include the projecting anchor elements and the capping board segments may include the retaining cavities. Methods and uses of such contact bars and capping board segments are also provided for hydrometallurgical refining operations.

A method and apparatus for forming a seal over a hole in a structure. The apparatus comprises a washer, a sleeve, and a fastener. The washer has a first channel. The sleeve has a second channel and an expandable section. The sleeve is positioned inside the first channel in the washer. The fastener has an elongate portion positioned inside the second channel of the sleeve to cause at least a portion of the expandable section of the sleeve to form a first interference fit with the washer.

A placard holder has a clamp member with an enlarged head and an elongated stem. The head defines a narrow slot such that a card containing visually perceptible or machine readable information can be mounted to the head by a friction fit of an edge of the card inserted into the slot. The clamp member attaches to a supporting article such as a display stand by extending the stem through a hole of a thin wall of the support and placing a lock washer over the stem opposite the head. The lock washer is forced along the stem end to compress the wall between it and the head. Compression is maintained by prongs of the lock washer that engage radially protruding teeth disposed along the elongated stem. Paper or plastic placards such as business cards, credit cards, place cards, gift cards can be placed in the placard holder for display.

A placard holder has a clamp member with an enlarged head and an elongated stem. The head defines a narrow slot such that a card containing visually perceptible or machine readable information can be mounted to the head by a friction fit of an edge of the card inserted into the slot. The clamp member attaches to a supporting article such as a display stand by extending the stein through a hole of a thin wall of the support and placing a lock washer over the stem opposite the head. The lock washer is forced along the stem end to compress the wall between it and the head. Compression is maintained by prongs of the lock washer that engage radially protruding teeth disposed along the elongated stem. Paper or plastic placards such as business cards, credit cards, place cards, gift cards can be placed in the placard holder for display.

A method and apparatus for forming a seal over a hole in a structure. The apparatus comprises a washer, a sleeve, and a fastener. The washer has a first channel. The sleeve has a second channel and an expandable section. The sleeve is positioned inside the first channel in the washer. The fastener has an elongate portion positioned inside the second channel of the sleeve to cause at least a portion of the expandable section of the sleeve to form a first interference fit with the washer.