A top view of a nice CD 183 Hemingray-71 with a brass bushing. You can even read some of the embossing around the perimeter of the insulator. Note the square impression in the glass which was used to interlock the bushing. When the glass hardened, this made the bushing very unlikely to turn. Compare this to a view of a [id:35124751; CD 168]. An interesting side view of this insulator can be seen [id=35135736; here].