Rick,
Thanks very much for your very generous offer, as it turns out I found the little devil!

So, if you were Lance's missing part, where would you hide?? In the clamp the dolt put it in himself! There it was in the "clamp drawer " I obviously placed it in when tidying up the bench top! It's a good ending to a frustrating couple of hours. Now I can install the middle wing, get these parts attached and cleaned up prior to paint and all's well.
I do have to Thank you again and remark on the helpful and generous nature of our Members, if only the world at large were so genuinely willing to help their neighbors ....... I help others when I can and am always amazed at how quickly a request for help here is met with unselfish generosity. We are fortunate to have the bond created by common interests and obviously values as well.

Cheers,
Lance