if i remember correctly ,this is the basic,remove plastic cover on bobbin,remove needle plate,remove hold down plate on r/h on top of bobbin case,secured with 2 screws,remove bobbin case.clean hook area properly and lubricate where bobbin case fitts,fitt bobbincase and hold down plate.bobbincase must turn freely and without jumping when handwheel is turned.adjust holding plate to allow ,5mm play between plate and bobbin case at r/h front area.hope it make sense
johan, April 2013
