Hello Norma.
The reason the bobbin case may be falling out of the machine is because you are not listening for the final click of the bobbin case, when you put the bobbin case in make sure you hold it by the spring clip, push the bobbin case in and then let the spring clip go and it will snap on, if you e-mail me I will give you a list of sites for instruction books but I don't think any are down loadable for free, drivewithken@blueyonder.co.uk
Ken
drivewithken@blueyonder.co.uk, December 2007