A good example is the following:
The circle is a baseplate that should go in the tower but causes it to explode so I removed it.
When it is OUT of the tower and NOT in contact with it, setting the ‘Cluster Group Index’ to 0 causes the tower to explode.
The tower is in index 1.
I am guessing the wider community has no idea what Unreal is doing because there isn’t a video out there showing someone making a complex structure that can be partially damaged.