Hello Dee,
Top tension about 4 or 5, you should be able to pull the bottom thread through with slight resistence, if it is too tight slacken the screw on the bobbin case about a quarter of a turn at a time anti clockwise and test, if still no good email me and I will attach timing instructions, type my address as you say it not as you see it.
Ken
drivewithken at blueyonder dot co dot uk
May 2010