Gail,
Once you get the old covering off and the machine out they are very simple.
Harbor Freight has inexpensive clamps if you can't find your dads.
Here's a couple threads I did about cases:
{
http://www.quiltingboard.com/vintage...r-t199606.html }
{
http://www.quiltingboard.com/vintage...d-t200795.html }
{
http://www.quiltingboard.com/vintage...x-t202882.html }
Joe