You'll need a allen/hex key to re-install it- same one you used to remove it if it was connected!

You need to line it up with the hole as you put the unit back in- so make sure it's facing toward you and not hanging down- make sure the screw engages the hole and before you've pushed the whole unit all the way in tighten up the hex screw a turn or 2.

Then you should be able to put the whole unit back in, then adjust the screw so the flap is open/closed corresponding to the wheel on the centre vent. Otherwise you have no control over your fresh-air amount into the cabin.

Thank your lucky stars you don't have a passenger side airbag- this has to be removed to get at the side screw holding the centre vent in!

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys