Heyy y'all! I have an object with helical structure wound over a cylindrical Object. One side of the object is fixed.

At the edge of the other Side, I give an external Displacement of 30 degrees. (as shown in the picture)
At the end of the simulation, the side with the external Displacement, in addition to the rotation **expands ** radially. (Seen in the video attached)
How do I stop that from happening?
Happy to hear your solutions. Thank you!