Many Tau players are well aware that buying a Sky Ray box is the best way of obtaining all the parts necessary to create a Devilfish, Hammerhead or Sky Ray. However, only the Devilfish uses the front Burst Cannon; the Targetting Array is the nose cone for the Hammerhead and Sky Ray. This short tutorial will show just how easy it is to create a magnetised front turret so that the player can alternate which vehicle he wishes to use just by swapping a Burst Cannon for a Targetting Array.
The mount.
Many people will just cut out the piece of extra sprue from the turret hole and throw it away. However, this piece of seemingly useless plastic is an exact fit for the turret, and will form a perfect mount for placing a magnet. The circular section fits precisely into the recessed area and the two “wings” are wide enough to catch behind the uprights, as can be seen in the picture. However, do not yet glue the mount in place.
The Burst Cannon.Only the front section of the Burst Cannon is required. Taking both parts separately, make a cut using a razor saw just where the square housing meets the circular section leading to the barrel displacer [arrowed in the picture].

This will leave the Burst Cannon with a small “neck” onto which a thin piece of metal can be superglued.

The next step is to drill a hole in the surface of the circular facing, ensuring that the hole is as centrally placed as possible. This is to house the magnet. In this example, a 2mm wide by 1mm deep magnet was used. This tiny magnet has an amazing amount of attraction power for its size, but the piece of spare sprue is large enough to accommodate a 3mm wide by 2mm deep magnet which would be a stronger option.
It is important that regardless which magnet is chosen, the depth of the hole must be drilled accurately to allow the magnet to sit flush with the surface of the plastic. Once this has been achieved, the magnet should be superglued into the hole.
A small piece of flat metal sheet should now be cut to size and superglued to the Burst Cannon body where it will meet the mounting piece.

The mount assembly can now be glued in place in the turret. It is important to check that the circular facing is as perpendicular as possible to prevent the Burst Cannon from pointing up at an angle when it is fitted and to ensure that the Targetting Array is able to be seated correctly.

Once the glue has set and the mount is solidly fixed in place, the Burst Cannon may be fitted and removed as desired.
The Targetting Array.Only a small amount of trimming is required to ensure the correct seating of the Targetting Array. This is done by making a small incision vertically followed by one made horizontally at the points indicated in this picture. This piece is then removed to get rid of the curved nature of the rear centre section.

The idea of this is to create a flat mounting surface for the piece of metal plate which will be fixed to the back of the Targetting Array.
The metal piece needs to be cut accurately so that it does NOT overlap the sides of the rear centre section of the Targetting Array, otherwise the unit will not fit into place.
Here is the finished product with the metal plate superglued in situ.

This now allows you to swap the Burst Cannon with the Targetting Array, thus permitting you to use the vehicle chassis as a Devilfish, a Hammerhead or a Sky Ray.
If you prefer not to destroy one of the large burst cannons supplied with the Sky Ray sprues you can always use one of those supplied with the XV8 Crisis suits. Those BCs are certainly not to the same scale as the vehicular version but using one does save the destruction of the larger BC.
A full set of four step-by-step articles concerning magnets and Devilfish can be found
here.
E.