Remember the Dreckolator [id=382210613] ? And here it is...
By Dave Kingston; posted October 24, 2013
View Original: Click to zoom, then click to magnify(2832 x 2128) 1479KB
...installed on the porcelain. There is also a metal "ring" (for want of a better term) that bolts to the railroad tie and holds the insulator in place.