I was wondering if you have ever seen support hooks like the attached. They were removed by a co-worker from his house (which is apprx. 120 years old). The triplex going to his house was supported by a more standard porcelain insulator, and this hook was nearby. Note in the second picture the slot in the middle w/the threading... looks like the wire was put through there and some sort of cap went over the top. In my 13 short years in the business I have never seen these and was wondering if anyone else has!