Question about Kodak 2D extension rail "connector"

[klw]

Can anyone please tell me how the "connector" on the extension rail is supposed to work? I understand that the rail ist fixed with the screw, but how is this little round "thing" supposed to work? There is a spring driven "lock" part on the other side (not shown in the picture), but there seems nothing to lock in on the circular part on the extension rail...



TIA

--Matthias

[Jon Shiu]

The round thing is supposed to push down on and cover a spring loaded safety stop that keeps the rear standard from coming off of the back of the tripod base when there is no extension rail present.

Jon

[klw]

Ah! Thanks a lot

--Matthias