Articulating Machine Foot (Metric)

So, I am designing an outfeed table for my DeWalt table saw. One of the problems is making sure it's level with the tabletop, so I decided to install articulating feed on the bottom of my saw in the supplied holes, so I can change the height as needed.

The problem is that the holes are at an angle, so I needed articulated feet. No problem. I looked up articulated feet, and I couldn't find any that had an m6 thread size, which is what would fit the hole, so I decided to make this model. 

It took a few iterations to get the fit right, but these work every time, and the ball breaks free with minimal effort.

Update: added m4-m8 sizes