I hope I can help, by looking at your picture and googling the machine, which I am sure you have done, your machine only performs one type of blind hem stitch, by looking at pictures on the internet, some blind hem stitch machine will do a variety of blind hem stitches. It would appear to me that because your machine only performs one kind of stitch,you cannot adjust the needle position, it is fixed to perform the one kind of stitch. That is only a guess from my Googling and looking at your pictures, I hope someone here can give you a more defined answer from their experience with a machine similar to yours.