Drop-in Bobbin Case Position

Here's a picture of an open Drop-in Bobbin System.  This is a picture I took of a Bernette, but is similar to a Singer 7422.  The bobbin holder (sometimes called a bobbin basket or bobbin case) is in its place in the top picture.  You shouldn't have to loosen any screws to remove the bobbin holder.  But if it's hard to get out, turn the hand wheel until the opening in the hook is just below the retention finger.  The hook is the metal ring that goes around when you turn the hand wheel.  To put the bobbin holder back in, there's a small bump at the front, that can bounce on the spring.  And a bigger, flat bump on the opposite side that the finger will touch.

Some other sewing machine mechanic wanted to charge $40 to put a bobbin holder in!?!?  You can do this!!!