Engaging piece for window regulator

A driver (4,5) for a window lift mechanism (1) in a vehicle comprising:

• a receiving fork (7) including first and second sides (9, 10) defining a gap (8) therebetween, wherein said first side (9) includes a plurality of openings (19) extending therethrough and a sleeve (12) having an externally threaded portion and a threaded bore (20);
• a screw (14) extending through said first and second sides (9,10) of said fork (7) and into said threaded bore (20) for tightening said gap (8), said plurality of openings (19) in the vicinity of the axis of said screw (14);
• a pressure piece (13) that is operated from outside said fork (7), wherein said pressure piece (13) extends through said plurality of openings (19) into said gap (8);
• and
• a threaded nut (11) screwed onto said externally threaded portion of said sleeve (12) to operate said pressure piece (13).