Swapping pigs

Thanks for the link, it clears things up. While examining the UJ I noticed the inside locks; wondered what I had because I'm used to the more common 1330/1350's. I have the 7290's.
Oh I see, you are having a problem at the other end. I ran into that too,once.

I think I got confused with what goes where.
I hear you. They're both laying in front of me and I have to stop for a moment and think which one is going where...