The middle insulator disk in this string is a little on the chinsy side. It does not measure the standard 6 inches and is 5 inches and some change! The stamp, which is not very readable says PP which I guess is Porcelain Products. What I don't know is if PP made it intentionally as a 5 inch disk or it is supposed to be 6 inches. Any of you experts on these hangy things got any ideas?