Note the spring sticking up. It pushes against the back of the diaphragm and has 5 shims of varying thickness under it within the throttle body so it pushes harder with the shims in place.

The rubber hose is the attachment point heading to the intake manifold and allows for a vacuum to be created within the throttle body essentailly pulling on the diaphragm (as far as I can figure out). remember earlier, removing this hose allows the motor to really rev immediately...

The throttle lever on the side of this assembly seems to allow the rack to move backwards (toward teh rear of the IP) during acceleration.

Attached Thumbnails

 

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique