Use Service Kit to keep sewing machine and overlocker at peak performance with regular home maintenance Use the large screwdriver to loosen and tighten the needle and presser foot holder screws. Also use it to unscrew the throat plate for easy removable of the bobbin and bobbin case. Use the generous size cleaning brush to clean fluff and debris from the bobbin race and feed dogs The smaller screwdriver can be used to adjust the tension screw on the bobbin case
