That's good advice from Annette (quiltedsunshine). I sew using Brother machines. I use a 2.0 for regular piecing and a 1.5 for paper piecing. If I use a 2.5 length, my seams are too loose and my threads pull out very easily unless I lock the beginning and ending stitches on e.v.e.r.y seam. And that is truly a pain for me.