A router (10) comprises a housing mounting a motor having a chuck (18) on its output shaft (14) which receives a rotary cutting tool (not shown). A base (32) is mounted on the housing for axial slidable displacement with respect to the rotation axis (30) of the tool chuck and has an aperture (34) through which the tool protrudes for working on a workpiece (40) beneath the base. A template guide (50) is provided which comprises a plate (52) radially adjustably securable in the base aperture and having a downwardly depending cylindrical skirt (58). The tool (not shown) passes through the skirt (58) and the template guide which is centred with respect to the tool chuck by a centering plug (80) having a stem (88) for reception in the tool chuck and a conical surface (82, 84) concentric with said stem and is pressed against a concentric edge of the skirt to centre the skirt with respect to the conical surface prior to securing the template guide in the base aperture. IMAGE
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