There are no contact points, only holes for what I suspect is for a detonator or detonation cord. The slot is a mystery for me too.
The device measures 16cm in diameter and is 3,5cm thick. It is marked "Dummy". It can not be taken apart, it is glued together.
The device measures 16cm in diameter and is 3,5cm thick. It is marked "Dummy". It can not be taken apart, it is glued together.