Thanks for all the help. We ended up doing one at a time and using the fishing string with a wrap of electrical tape to keep line from getting snagged. The mcp showed to tension by getting the springs within 1mm of each other. Reset the belt info in controller and was up and running. The mcp referenced a temporary crosshead that could be bolted in to the plates on top of car and the using single beam clamp and hoist to pick car up. I didn’t hang car I tightened up middle shackle to carry the weight then changed outside belts one at time then lowered middle shackle to put weight on outside 2 Changed middle and tensioned.