Abstract: The invention to which this application relates is to a mechanism for the tensioning of a spring, typically a coil spring (1) of the torsion type, said spring (1) having first (20) and second (22) arms which depend outwardly from either end of the coil and the spring (1) is provided to create a biasing force. The apparatus is typically a power tool and the invention provides an effective means of tension the spring (1) at the time of assembly of the tool by using components fitted as part of the tool.

Abstract: The invention relates to a power tool such as a router which is provided to perform an operation on a work piece. The tool includes dust extraction apparatus to allow dust and debris to be removed from the location at which the work is performed and part of the extraction apparatus is movable between storage and in-use positions. When said part is moved to a storage position, an alternative dust extraction passage may be fitted in to the port or aperture. Typically, the part which is movable can be telescopically movable or alternatively, can be provided of a flexible member so as to be moved between extended and retracted positions.