How to detect force on clumped facet members individually.

I am simulating the penetration of a screw pile into the ground and measuring the penetration resistance of the screw pile. The screw pile consists of helixes wound around a central shaft. I created the helixes and shaft using geom.facets and combined them into a clump. I then applied rotation and translation to the clump to simulate its penetration into the ground, which worked as intended.

During this process, I aim to measure the interaction between the screw pile and the surrounding soil to determine the penetration resistance in terms of forces. Specifically, I want to measure the resistance contributed by the helix and the shaft separately and then combine them to calculate the total resistance.

However, I encounter an issue where the forces on the screw pile are zero, even though it is interacting with the soil.