backpost

plural backposts

1. A pole or post onto the front of which items to be used are attached.

   I know one chair company whose product engineer built a backpost boring machine on which all the boring heads are fixed in position.

   1971, Furniture Production, volume 34, number 235, page 25

   1 more example

   The built-up type of rudder, i.e. the rudder produced by shrinking forged arms on to a backpost, is a very nice example of fabrication without welding.

   1949, Steel Processing and Conversion, volume 35, page 588