Here is a drop bracket with a strap to the pin bolt. As I recall, there was a strap on top of the arm that connected under the top of the bracket to the pin of the other line wire. Also, note how big the crossarms were for these carrier circuits, this fit an arm that was 4 3/4 " x 5 3/4 ", much heavier than a standard 3 x 4 ten-pin arm. I also recall seeing a super heavy phantom bracket with the same straps on each pin.