Quick and simple line boring bar

[Toolmaker51]

Hats off guys. Who noticed the shop-made steady rest too? Wood planks help isolate vibration, clamping "beds" the ends into wood [instead of a tiny point of metal-to-metal contact], the setup is shimmed for height and level on the machine's own centerline. A vertical or horizontal mill couldn't very well support both arms and running bearing, or maybe even enough quill travel.
While similar tasks have been addressed in this manner; used to be only isolated tradespersons actually practiced them. Some due to 'job security', but communication wasn't quite like now either. Also illustrates why the Lathe is King of All Machine Tools. This is how the act of preservation feeds itself. Having reliable tools help, like a full set of 12" C-clamps!