(57) forming a telecommunications cable core unit (10) in which conductor pairs (12) change
their relative positions along the core unit. The conductor pairs, as they are fed
towards a core-unit forming means (20), are passed through individual guides (58,
96, 100, 108) which are movable independently of each other laterally of the feedpath
of the conductor pairs and within certain confines. A fluid force is used to cause
this guide movement. The fluid force may be the force created by an air flow, in which
case the guides are buoyant. Alternatively, the guides are or comprise a magnetically
permeable material (64) in which case the fluid force is that created by a magnetic
field which has a changing flux strength and field pattern.
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