We bought a new hose for our Polaris 380 which has new everything--floats, backup valve, external filter. We cut the leader hose to match the maximum depth of the pool as per the directions. We tried to screw the hose nut back on after attaching the hose end and the hose nut would not screw in over the bumped out area at the joint. The hose nut would go around and around but not move forward to secure the hose in place. We turned the hose nut so much the hose nut threads actually cut through the hose. Any suggestions for an easy process to screw on a hose nut? The Youtube videos make it look so simple!