PURPOSE: To carry out the title threading in saved waste of time and labor of yarn feed by passing yarn end fitted into a spindle of double twister through a shaft hole of spindle to carry out threading and then passing the yarn end through a guide and applying twist to the yarn end by rotation of spindle to wind the yarn on paper pipe.

CONSTITUTION: A yarn feed package 3 is fitted into each spindle of a number of units 2 arranged to double twister 1 in a row in a state vertically supported together with an adapter 4 and end of yarn Y pulled out from the yarn feeding package 3 is passed through shaft hole 3a of spindle 5 to carry out threading and then fed to the upper part of the spindle to pass the yarn end through a snail guide 10 and then yarn is wound on the paper pipe 6 subjected to rotation driving while applying proper twist to yarn end by rotating the spindle 5 and threading of double twister 1 is practiced so as to wind selvage.