When I first installed them, none of them worked. At first I was very disappointed. Then, having some knowledge of electricity, I pulled out my ohmmeter and figured that couldn't all be bad. Of course, everyone showed a good read. The next thought was that maybe they had no contact with my device. I tried again but this time I tightened them up more than usual for lightbulbs and it worked! If you have this problem, try tightening it a quarter turn more. This worked for me.
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