top of said snag means which causes the yarn to snag once snagged the yarn breaks between the disposal means 23 and the pirn 10 and starts to wind on the pirn as the traveller ring 17 continues to rise in this preferred embodiment the snag means 11 has the shape of a truncated cone having its base affixed to the spindle this shape causes the horizontal section 32 of yarn to meet the crack 33 of the snag means and pirn joint at a preferred angle so as to facilitate entry into said crack 33 it will be appreciated that in other embodiments the snag means 11 may employ means to cause snagging other than a crack lined with sandpaper the interaction of the components during cut down may be described with the aid of fig1 the yarn is winding on the pirn 10 in normal fashion when the traveller ring 17 is lowered to its lowest position for doffing as said traveller ring 17 is lowered the yarn between the traveller 18 and the pirn 10 is caught by the cut down guide 25 which is mounted above the disposal means 23 the horizontal section 32 of yarn 31 is guided down to the disposal means 23 and across the cutting edge of cutter blade 26 thus.