I got it back together. Thanks, Mickey. The Indian youtube video was the trick. Since my latch was in one hinged piece, it varied a little bit. I'm not sure that's the way I put it together last time, so maybe it will stay together this time.
What I had to do was partially insert the tab, then insert the spring and finish inserting the tab. It went together really easily. It does have a little tiny screw in it that I will tighten. I'm going to do some demo stitches, so I should know if it's going to fall apart again before I sell it. I assume if it sews a straight stitch and a zigzag, then the bobbin case is correct. Then, if it falls apart, I will at least know what case I'm looking for. I just noticed his one has a J-HI on it. The machine is embossed on the bottom with an HI, in addition to JA and JC numbers, so this might be the right case.
Thanks for all your help.
bkay