Excuse me, what is the working principle of the shock absorption shaft of this desk lamp base? Why can a lamppost stay at any angle without sinking? Trouble is right.

This resistance shaft, also called torsion shaft, has a slightly smaller maximum torque. If you apply a little force by hand to make the torque greater than the torque of the shaft, you can turn. Once you release your hand, it stops again, because the maximum torque of the product itself is slightly less than the torque of the shaft. This is how the torsion shaft works.