Hi there, I've just built a crane (well, actually a jib arm), to be used on a film dolly with a camera on one end and a counterweight on the other to balance it. I'm a bit worried about the weight I'm putting on the bearings and so I started calculating. But I'm having a bit of trouble figuring out how much weight is being put on each point. How much weight is PIVOT POINT A taking and how much weight is PIVOT POINT B taking? Could someone enlighten me? The MAIN ARM has a mass of 2.1 kg/m and the CONTROL ARM has a mass of 1.1 kg/m. Then there is the mass of the camera on one end and a massive counterweight on the other end. Does PIVOT POINT B actually take any weight? Thanks very much for any help.