Insufficient Thinset Coverage with 1/4" x 1/4" Trowel

What happens here

The presenter introduces tile leveling clips, which are used to ensure an even surface between tiles. He demonstrates that these spacers create an 1/8 inch gap above the substrate. He then applies thinset mortar using a 1/4 inch by 1/4 inch notched trowel. After setting a tile and applying downward pressure, the tile is removed to reveal poor thinset transfer and minimal coverage on the tile's back, indicating insufficient adhesion and potential for hollow spots beneath the tile.

Goal: Demonstrate poor thinset coverage when using a small trowel with tile leveling clips.