Abstract: A knitting machine attachment using pressure air flow through, and discharging from, plural flutter tubes to control the accumulation of lint. Each individual tube construction consists of an inner circular bore and an encircling eliptical wall which causes a flutter or pivotal traverse in a specified plane or path, namely that in favor of the weaker or thinner walls of the tube. This maximizes the amount of discharging pressure air that can be directed against specific locations where lint is likely to accummulate.