Take a (Brookfield) CD 134, (or pehaps it is a CD 160), add in some metal hardware and a split porcelain ring, and voila - a tree insulator. Presumably the large bolt screws into the tree (or perhaps the side of a barn) and the wire is fed through the two-part split porcelain ring, which is attached with a snap-clamp. THis is somewhat different than the more common Holmes Tree Insulator, which used a U-bolt to attach the porcelain ring. As shown if you proceed to [id=124593741]