Dyrlund flip flap table hardware  

I don't know, but the theory appears similar to a lot of other danish tables. Can you take a picture with the central "leaf" removed?  
 

The 2 locating pins you need have a thread cut into the steel rod.
a simple fix with a tap and dye set or a few beers to a mechanical engineer

Here is a picture of the frame work.

Do the locating pins have a nut on the bottom side of the frame? I know the top needs room to raise up to let the leaves out but didn't know if there was like a spring and a nut on the bottom side of the frame.
Thanks in advance.

No they are simply guide pins.
They measure 7cm L / 2 3/4 inch
email me for additional images of the pin
Simon