SWB mfg makes a tensioning system that is pretty easy to install. Put the ball links, 4-40 threaded rod, and nylon tensioners onto the servo arm. Then tape the control surface at center, put the servo at center. Now just pull the cables through and crimp them. Make sure you take up all the slack but don't move the servo or surface. Also make sure the tensioner has at least 50% adjustment left to tighten it up to proper tension. I really like the SWB servo arm and tensioning system. I bought the pull pull cable from him too. Note that the servo arm is way longer than it needs to be. No biggie