Briggs and Stratton linkage help please

Hi guys,

Today my B & S wouldnt start, so i pulled the carb apart to clean it up.
Once i put it back on i noticed that regardless of the throttle position the white throttle butterfly clip will not move.

This is the first time i have cleaned the carb on this mower.

Is there another spring or something missing, hence why it wouldnt start in the first place OR have i put it back together wrong?

Thanks
Mark
DSC_0028.JPG123.jpg

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