I originally thought that the flat-ball was retained by a crimped edge, similar to the elephants foot retention, but the Kedo flat-ball is retained in the socket by adhesion to the supplied moly grease.
The ball can be rotated in its socket so that a tiny screwdriver can get behind it to pop it out.
The ball is highly polished, and the adjuster screw's pocket is very well machined, smooth, and black oxide plated. There's also a tiny oil reservoir dimple at the base of the ball's pocket
About 1.5mm is ground off the 6mm ball to make the flat face. This means that the ball's rotation center is only 1.5mm above the valve stem end. This should reveal a different 'scrub' distance.
The Kedo flat-ball adjuster alongside a stock XS650 adjuster for comparison.
The Kedo adjuster has a hex key pocket, so it doesn't need to be as long, and will be lighter.
Did an impromptu lean angle measurement, and found that the Kedo adjuster can be leaned over as much as 30° from vertical. The lean angles of our XS650's adjusters are in the range of +/- 6°, so no concern here about adjuster angles...