These e26 socket strings are seemingly heavy duty. They're heavy enough that the tight compression fittings the bulbs slip into won't accept LED bulbs that don't have a smooth taper expanding above the actual socket. I found that putting an old style full glass bulb in the socket first worked well to stretch the collar of plastic enough that I could, with extreme force, twist and push the LED bulbs into the sockets.Basically, don't give up just because you can't push the bulb in. Stretch the socket.
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