Abstract: For mounting the hollow ends (H) of a curved handle (G) in an orifice (B) on a contact face (A), a guide member (30) for a screw (29) has a base flange (31) which can be connected to expanding parts (39, 40, 60, 64) or a securing member (47) and on which there rests a tubular supporting member (12) which overlaps the hollow end (H). A cap nut (20) having a peripheral groove (24) for fixing the hollow end (H) through a setscrew V and wrench faces (33 and 23) like the head (32) can be screwed on to a head (32) of the guide member (30). A shank (37) of the guide member (30) with a conical end (39) or conical nut (64) directed against it can be pulled into an expanding nut (40) or an expanding tube (60) by means of the screw (29), enlarging an expanding basket (42, 62). A door handle (50) can be fixed, for example, on a multi-chamber profile (M), with the securing of a polygonal pin (47), the guide member (30) being secured externally by a flange ring (55).