The thread on the cartridge is very soft plastic. (Although some of the product photos on the site show metal.) This means it's easy to remove the threads, or worse, it broke one of my bulbs because the bulb's base was wedged into the plastic so tight that I she unscrewed the light, the base was plugged into the socket. Because of these problems, I've spent a lot of time on this thing, and now I don't have a lightbulb.
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