When I first bought them I installed them and they didn't work. You could shake them and hear some rattling inside, so I figured they were just broken or defective. A month later my wife tried to see if they were working and she managed to get them to work. Wonderful. I twisted and pushed and pulled them and they never worked but they do. I see a lot of people saying they bought them and they don't work but you can let your wife try. I'm just saying.