The horizontal feature of my Rockwell 21-122 is awesome... except for the hassle of setting it up. The vertical head and motor are heavy, a pain to remove and re-install, and irritating to re-tram.

Inspired by a horizontal adapter seen in a magazine (Home Shop Machinist, Sept/Oct 2014 edition), I'm building a "quick-change" horizontal overarm support which will mount on the same shaft as the vertical head.

4:30 Chips start to fly if you want to skip the explanation of the project.