The dial with the numbers has no effect on my stitch length. I keep it cleaned and oiled really good . Like the Valdez . I adjusted the bolt with the square heads and even though the dial isn't touching it it still is sewing at 5 1/2-6 stitches per inch which will do I guess. If the dial is set on any number and it touches the bolt kn back that has the square head it sews in one hole