I have been having troubled with my 380 tying itself in knots so I decided to replace the swivels. I had tried some of the cheaper ones in the past and they either didn't work well from the get-go or they started to lose their spin within a few months. I ordered a pair of swivels from an online Polaris dealer and when they arrived they did not look like nor function like the Polaris swivels I had purchased in the past. The design was different and with the original polaris swivels a flick of the finger would have them spinning like a roller skate wheel while these barely moved. I contacted the dealer who confirmed they were genuine Polaris swivels. I then contacted Polaris support and sent them photo's. They confirmed that I had received the correct part but since I was not satisfied with the way they spun they replaced both under warranty. The ones I received from Polaris were exactly the same and still lacked the smooth operation I had come to expect. I installed anyway and the cleaning head is. still tying itself in knots. Did Polaris make a change to their swivels and not for the better?