This extension cord is generally good quality but has its own characteristics. In some sockets, the plug can be easily inserted. With others, on the other hand, the plug has to be plugged in – tediously. Apparently some of the metal prongs in the extension cord don't match the sockets. It's possible that the parts will gradually come together as you use the extension, so I'm hoping that the problem will go away over time. On the other hand, I don't think an extension should require a break-in period.
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