After doing some testing (a clean setup, new save, only mods are infernal Robotics and his one) I've determined that the LEE and PDGF will not self dock. It will dock with other objects ok but not self dock. I take the exact same craft remove the LEE/PDGF and put on stock docking port JR's and it self docks fine. Perhaps your magnetic strength is set too low? I know it's partially working because when I decuple a part with a PDGF near a LEE, the force from the LEE will PUSH the part back a bit as it falls. clearly either I'm using a part backwards (the PDGF's I assume go with the post bit out, and the LEE goes with rounded bit to the arm.) Perhaps some settings are wrong? Christopher