Fitted the device no problem (you may need more than one pair on hands). However when I went to use it the motor does not work. I have followed the instructions to test the swytch kit and nothing works and the hub doesn't spin . I raised it with customer services who took 2 weeks to come back to me only to tell me to perform the tests again and tell them the outcome. I went through all this again went back to them, came back after a week just to tell me to fill in an online form. Very angry and sad as it isnt exactly cheap and I just have a bunch of scrap metal attached to my bike that doesn't work.