These adapters came quickly and have been working flawlessly for about 2 months. You might need to screw them in further than they seem to turn (this was the case for just one of ours). If so, just be careful and take it slow, since they are rather thin. One trick that worked well for us: screw them onto the lightbulb first and then grip the bulb and the rim of the adapter for maximum grip and control while you're screwing them in. This tip probably will work a lot better with an LED bulb than a corkscrew-shaped compact fluorescent.
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