<p>A fastener (12) assembly for joining a first element (13) such as a circuit board to a second element such as a casing includes a first component (19) which has a pin (20) and a second component (24) which includes a cavity (28) for receiving at least part of the pin (20). Either the first component or the second component is made of a material adapted to change from a first shape to second shape at a particular temperature. The pin (19) of the first component is adapted to be locked into the cavity (28) of the second component when the second shape is attained through interaction of the material with the cavity. The heating means such as resistors (14) for generating the particular temperature may be included in the first element.</p>
