Edelbrock carb secondary opening?

How do the secondaries on an edelbrock carb open?
It isn't vacuum operated and is opened mechanically, however when we operate the throttle either by hand or using the throttle pedal with the engine not running only the primary throttle blades open. When holding the primaries open we are still unable to get the secondaries to even open when trying to manually turn the secondary throttle shaft by hand. Is there are linkage or something missing from our carb that is preventing them from opening?
Please see the pics of the carb by clicking the link below, some of the pics are relevant to our other post regarding the kickdown linkage

https://s1081.photobucket.com/albums/j350/chrisandadam1/

Going from memory here...

The mechanical secondaries should have "weights" on them and should start to open when the primaries get opened to a certain point. If there is a "flap" on top it may or may not open unless the engine is running and warmed up.

I ran an Edlebrock with mechanical secondaries on my Ram Charger and it always performed well enough. I'll probably put one on my next engine build.