I believe it is Aluminium. I am not sure why it would need bending though... cutting down certainly.What type of metal is it? Could you not cut it down and attach a new bent shaft with the spike ?
The idea behind this is that when the opponent drives on (or is is driven onto) the wedge, there is going to be a pair of non return ridges on each side of the robot (in a similar shape to the robot itself thinking about it) which prevents the opponent from sliding back down. Once the opponent is in place, the spear will jab diagonally straight into the underside of the robot.
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