I am going crazy !!!! I have tried everything I know to use this darned thing, and it just wont work. What happens is - the needle just wont go down to catch the bobbin thread. I have tried it with and without the feed dogs covered, does anyone have and use one? Being an optimist, I bought a box of special emroidery thread - very costly - and now I'm stuck with the attachment and thread. PLEASE someone help me. I sew with a Brother LS 1520. I even took the bobbin holder out of the machine thinking something was wrong with that.