I haven't completed it yet, but I am going to wire up utility poles in a small town that is currently under construction. Instead of poly wire, I am going to use some .010" wire that I stripped out of some computer cable. It happens to be the same thickness as Berkshire Junction's EZ Line. It doesn't spring and stretch like poly wire, but I am using it where I will not have to reach over it to gain access to the layout. I believe that it scales out at a bit under 1". I laboriously drilled .021" holes with a #75 drill bit in each insulator. I don't have a picture yet because I haven't assembled them yet; I won't do so until the town is completed so as not to have to work around them. With a little practice, the holes went pretty easily, but you must have steady hands, and use Optivisors along with a good pin vise. A hobbyist drill press would probably work also. It's overkill, but I didn't want a glob of glue visible since it is an eye level scenic highlight.
Willie