I have changed to blindhem foot, removed right needle nd canged tensions.
It is not a special stitch, just a three thread overlocked seam with left needle but you do it with the blind hem foot and fold your fabric into a "z" shape, wrong side upwards and raw edge at the bottom to be trimmed by the blade as you seam. The folded edge is run against the "blade" of your blind hem foot to ensure even "bite" of the upper fold by the needle while the loopers form the seam around your raw edge below. Then when you finish and press the z fold open, you obviously want a little as possible of the needle stitch to show on the right side of the hemline. So you need to practice and adjust the position of the blind hem guide to ensure you are getting the needle to stitch just onto the folded edge.
I have only ever done it on knit fabric, as it does show and not very successful on a curved hem edge, straight edge is fine. You only want to catch a minimal amount of the fabric with the needle, lengthen the stitch length to 3 so there is less stitches per inch as it will show on the right side.
There is a tutorial here on youtube http://www.youtube.com/watch?v=aDJbFNZrCUI
There is also a great tutorial here which shows you how to make the 'z' fold the right way, this is the same whether doing a blind hem on a domestic sewing machine or a serger/overlocker. http://www.youtube.com/user/grosgrainfab...
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just set the setting on the left to 2,1,or 0 the upper looper to 6 and the tension to 3. i got my info on craftzy.com
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