Sewing Machine Won't Pick Up Bobbin Thread?

I have a Singer 201k which I have had for years and never had any problems with. I use it a lot and it has always worked beautifully, however the bobbin/bobbin case got jammed therefore the needle wouldn't move.

I gave it to a friend who is very good at fixing problems and he took the bobbin casing apart, oiled and cleaned and it works beautifully however I cannot get the needle to pick up the bobbin thread. I have spent hours and hours with no joy.
Any ideas?