A tool (38) secures and releases a fastening arrangement which includes a first component (10) and a second component (12) which may be releasably fastened together. Fastening is by means of a retention element (34) of shape memory material associated with the second component (12) which is reconfigurable...http://www.google.es/patents/US6646240?utm_source=gb-gplus-sharePatente US6646240 - Fastening arrangements