1. The problem statement, all variables and given/known data I´ll show the problem with a picture: 2. Relevant equations M=rxf Sum Forces = 0 Sum Moments= 0 3. The attempt at a solution I recognize that I am completely lost with this problem, so I´ll try to analyze every force acting on every body to show where are my doubts. When I analyze forces and moments acting at the part T1, I see a red force F2 applied to it, it is vertical, T1 acts on the tube through F3, I think that F3 is much closer to the axis of rotation at point A, so F3 should be bigger than F2, here arises my first question. The equation of moments for T1 tells us that F3 is bigger than F2, but What happens with the forces? I assume that there must be an equal and opposite reaction from the tube against T1, but it is difficult to imagine, that force must come from the tong T2 acting through F4, which I assume that is equal to F7, so on the y axis F3 and F7 should compensate, and on the x axis the friction should be equal to F7x+F3x. IF that is true, there is a net vertical force acting to T1 which is F2 and that can´t be true in static conditions. But I don´t know how to calculate the minimum value since Friction=μ N, I don´t know μ but I don´t know N too, I know that F5 and F6 should compensate forces throught x axis but I don´t know how to calculate this. Any suggestions, comments ... are welcome.