Hi there!
I need to model these steel wires:
The task is easy enough if I consider them to be a cylinder. However, how can I do it if they have a cylindrical structure where they attach (without having to painstakingly position them one by one)?
Yes, it’s very easy- make a structure in the shape of the wires, for example, a cylinder. Delete the top and bottom faces and edges. Add a skin modifier. Done!
Sorry, I’m not following…is that for create a single wire, or the entire structure?
It might be a bit cumbersome but when you use a bezier with only two control points and set the handles to auto choose your bevel values to your liking anf copy them in the distance you want, then you can scale the top one to almost zero like so:

…and then convert to mesh to youe liking…
This is not suited if you want some special end caps a.k.a. wire anchors…
…or use what @joseph just posted… ![]()
Both your methods are great, thanks!