The holder has holding portion (3) having base (6) and holding pins (4,5) which are arranged in a mutually spaced manner. The pin (4) has axial section (11) having tapering diameter, and pressure surface (14). The opening (8) of base has continuously tapering section (10) that interacts with axial section such that the pin (4) is pivoted transversely to pin longitudinal axis about rotational point which is formed, when pin (4) is seated in opening. A pressure element (15) acts on pressure surface portion on one side of central axis of pin (4) and does not cover central axis.
