Assembly comprising a passageway for livestock, the passageway being delimited by side delimitations, for passage of the livestock from a first space to a second space. The hollow housing has a holding portion and an aperture run through by a tool head. The spring is inexpensively formed as one piece of spring wire having independent spring coils for biasing the pawl and inhibiting counter-rotation of the output member. A plurality of personal candidates is identified from results of the search and profiles of the same person in different search domains are automatically linked. An adjustable picker assembly having cams gathers a number of yarn strands together.