I pull up the bobbin thread, hold both threads tight, set my length to small and make 3-4 tiny stitches. That way you shouldn't have a knot. Reset to normal stitch, do a few stitches and clip off your threads so they won't be caught up in your seam. NOTE: If you have a machine where you can store a program for more than one stitch, program your zig-zag setting to the smallest length and width. (This is the same as very small stitches on your straight stitch setting.) Now you will have your zig-zag programmed to do small stitches and your straight stitch to do normal stitches. Start your stitching on zig-zag and do 3-4 stitches to get your small beginning stitch, then switch to straight stitch. Close to the end, switch back to your programmed zig-zag. Remember your machine will likely go back to preset standards when you turn it off so you will have to reprogram when you turn it back on.