Prevent your needle from gumming up with this handy oiling device. Simply sit or screw the magnetic oiler onto the top of the machine and run the thread through its reservoir to lubricate your thread and prevent needle gumming when sewing through ripstop fabric with seamstick or lighter materials with two layers of repair tape. You can lubricate up to three threads at the same time and is compatible with threads up to size V-69. It also helps to make thread tension more consistent. Use Sewers Aid Silicone Lubricant (not included) in this Sewing Machine Thread Lubricator's Reservoir for best results.