It'smeagain

I realize this was posted some time ago. But, I just acquired this machine and I think it is worth saving. Mine is cosmetically very nice, and the motor is smooth and strong. It has required several hours of cleaning, oiling, and coddling to get to this point. the problem, it doesn't pick up the bobbin thread. There is no manual so, don't know whether timing is off, bobbin case is bad, don't have the bobbin case assembly installed correctly, threaded right, etc. etc. Can anyone offer as a possible solution.