Abstract: A grooved-gear wire puller comprising a pair of spur-type gears, one thereof being urged into tooth meshing relationship with the other gear of the pair which latter is positively driven, the teeth of said gear pair being grooved and the grooves thereof being disposed in mutually facing relationship thereby defining an aperture between intermeshing teeth for the acceptance of a pair (or plural pairs) of twisted wires to be pulled directed thereinto, the depth and configuration of said grooves being such that the intermeshing teeth successively grip the pair of wires with substantial force and simultaneously deform the said wire pair out of its entering plane and in manner as to impart of succession of closely spaced crimps in the twisted wire pair exiting from between the intermeshing teeth.