There are two options:

Option 1:

Simply add a piece of square rod onto the bottom of the curved duct sticking out of the side of the part.

Option 2:

Step 1

Remove the existing motor unit and sand back of vent to reduce the thickness slightly. Also remove duct on side of vent.

Step 2

Reshape curl vent as shown opposite.

Step 3 (motor body)

To build the motor body cut a rectangle of 2mm thick sheet styrene or one of the parts tabs from the sprue tree to approx. 6.5mm to 4mm and round the top corners with a file.

See Ducts in Vents Overview.

Step 4

Cut a notch into the motor body to form the duct and reduce the height of the duct by 1mm to allow for the raised platform that funnel no 1 sits on.

Now glue the curl vent you modified in Step 1 onto the front of the body of the motor unit.

Step 5

Build a motor unit as described in Steps 3 & 4 of the Motor Unit section of the Vents Overview and glue to the back of the motor unit opposite the curved bottom of the curl vent. As seen in diagram at the top of the page.