The vacuum element for controlling the fresh/recirculating air flap has (finally!) failed on my 1983 300 CD-T.

Despite removing the glove box and panel that fits above the passenger footwell,I am unable to determine precisely how the vacuum element's actuating arm actually attaches to the flap.

Question: Does the actuating arm perhaps hook onto the flap? Is there a clip or pin to remove?

The FSM says, "Unclip actuating linkage on recirculating air flap." Hmmm. Can anyone shed a little more light on just how I will be disconnecting/re-connecting the actuating arm?

Thank you-