This is an initial list of all the available downloadable sewing machine manuals, service manuals, parts lists and instructions that could be located. It is not, nor ever will be, complete but we will endeavour to update it when new sources come to light.
Possibilities are: foot pressure adjustment tension dial adjustment stitch elongation If you can already identify the tension adjustment dial and this device is above the pressure foot, then I would gess it is the first one, foot pressure adjustment. Many models don't have this but it was standard for many years on all machines, allowing you to control the pressure of the foot onto the needle plate, something you need to vary if you are sewing very heavy coatings or very fine silks, sometimes you just need to finesse the pressure yourself. Aug 20, 2011 .