I also use an old string for C9 bulbs, but removed all the bulbs and put strobes in randomly wherever I think I need them. I have not removed any old sockets and have used this string for 4 years. For halloween, but the string is hanging underneath my porch roof, but for Christmas I hang the middle of the string at the top of the tree and just drape it down two side of the tree. Works fine. i never make work when I do not need to.