Hello Emir,
Make sure the presser foot is up when you thread the machine, top tension should be about 5, you should just be able to pull the bobbin thread through with some slight resistence, if it is too tight slacken the screw on the bobbin case ant-clockwise about a quarter of a turn at a time, only use number 50 or 40 mercerised thread on that machine.
drivewithken@blueyonder.co.uk, October 2008
