a bore 28 off set 1 16inch or 1 59 mm from the center or axis of shaft 26 bore 28 is parallel the axis of shaft 26 center shaft 26 can be retained by a pair of sealed bearings 32 contained in bearing housing 30 bearing housing 30 being connected to the case of sewing machine 10 a screw 60 to be connected into the bore 28 will then move left right 1 8 inch or 3 18 mm during a complete revolution of the second gear shaft as seen best in fig4 and 5 in fig4 the screw 60 is 1 16inch or 1 59 mm to the right of the center or axis of shaft 26 the center being designated 34 c l 34 for center line in fig5 the screw 60 is 1 16inch or 1 59 mm to the left of the c l the spreader 34 is attached to a generally upright pivotal bar 36 the bar 36 having a first distance 34 x 34 from a lower pivot point 38 to the upper spreader 34 the spreader 34 connected to an assembly which is attached to bar 36 at spreader top portion 40 at a location about half way between the pivot point 38 and the spreader 34 or a distance x 2 from the pivot point 38 is connected a generally horizontal bar assembly 44 using for example a screw 60 the distances 34 x 34 and 34 x 2 34 are identified in fig4 the other end of this generally horizontal bar assembly 44 is connected to the screw 60 in the off set bore 28 in.