Hi im new to this forum , I have just gotten a new to me 206rb1 consew , the problem I am having is the stich length , its says in the book it can do 7mm stitch length ( wich is 3 3/8 stitches per inch ) but the best I could get it to do was 4 1/8 stitches per inch I replaced dog needle plate , and took it apart bottom end put it back together and fixing to set all the settings on this machine per the manual . Is there an adjustment that will reduce or lengthen the stitch other than the stitch lever ? Or 4 1/8 stitch per inch is the norm for this machine , any help would be appreciated thank you.