Aston Martin DB 9 2010 Manual page 115

The Allen key is required to lock the Roof in position.
[1] - To Raise the Roof Manually if the Tonneau Lid is Closed with
the Roof on Top
Manually raise the Roof to the fully raised position.
Make sure that the hook on the last Roof joint engages
correctly on both sides.
Remove the trim plug.
Make sure the two lock
arms are located in
their catches.
Locking the Roof manually may require the assistance of a second
person to push down so the catches engage while the allen key is
turned.
Using the allen key provided in the
vehicle tool kit, lock the Roof in
position. Continue to turn the allen
key until no more movement is
possible.
Do not use power tools. The
Roof manual lock and unlock
mechanism may be damaged if
power tools, i.e. an electric drill,
are used to lock or unlock the Roof.
Many turns of the allen key will be required to lock the Roof.
6.7