long straight wire with a small gripping or pinching hook at its lower end as described for example in u s pat no 3 574 273 as illustrated in diagrammatic form in fig3 and its right side elevation fig4 the s twist tool 10 of the invention typically comprises an unbroken length of fine gauge wire having an elongated handle segment or leg 12 and an acute angle bend 14 separating said handle segment from a shorter segment or leg 16 terminating in a substantially u shaped hook 18 this hook preferably lies in a plane substantially perpendicular to the plane of bend 14 and its short leg 20 lies to the right of center when leg 16 is oriented vertically in front of leg 12 as in fig3 the dimensions of each tool are largely dictated by the dimensions and location of each type of spindle to be threaded it is particularly essential that the tool be small enough to permit both its two legs and three cross sections of yarn to be pulled simultaneously through one of the two openings between the pin and the wall of the spindle top a stiff but still moderately springy material such as music wire is the most suitable material of construction actual dimensions of a tool for a specific spindle are given hereinafter although best suited to spindles with the pin located at.