A clamp arrangement for securing a needle (11) to a needle support member (12) includes an interface arrangement between a first clamp segment (16, 16', 16"), defining an inner end of a baler needle (11), and a surface of a needle support member (12), on which a second clamp segment (20) is located on a side of the support member (12) opposite to that engaged by the first clamp segment (16, 16', 16"). The interface arrangement is such as to permit the needle (11) to be rocked sideways so as to adjust an outer twine delivery end of the needle (11) from side-to-side as necessary to bring the twine delivery end in correct alignment with a knotter mechanism.
