For small to medium size Christmas tree, max 1.5 meters tall and 50 mm diameter stem.
If you have a larger tree a scaled model might work but have not tested this.
Lay the "Center assembly" upside down on a flat surface. Use a hammer or similar to fit the "roots" in the designated slots.
Lay the tree on the side, and screw the bottom of the "Center assembly" into the center of the Christmas tree stem. Raise the tree.
Use spacers to level the tree.
1 x Center assembly
3 x root
3 x spacer
Rev 1, 19/12-2020: First upload