Hello all and good day, I am trying to adjust the stitch length on my 153. I’ve visited an older forum about the issue but haven’t been able to find a solution. The knob doesn’t work and tightening or loosening the small screw where you can see the 0s up top aren’t doing much. Right now it’s set at a low stitch count and would like to get longer stitches. Are there any other alternate suggestions? The photo is the screw I messed with, underneath there is no second screw.