I live in Greece and recently I was brought an Empisal sd4 overlocker as a gift form S.A. However, despite following the instructions [Manual and Vide] I am unable to get it to sew. I realize that it has to do with threading but I have followed the instructions ery carefully and also have been helped by others. I have also contacted y siter in S.A. on Skype and she said I was doing it correctly. I have come to believe that the machine may be faulty. please please help.