Small precision V-block for shaft concentricity measurement

You can find the source here: 

I'm not sure if he's uploaded any of his designs? But tried to model what he showed in the video as the small v-block.

Used 6mm x 40mm ground pins as the rods, there are also 6mm bearing pins available, which might be harder. Fancy unit could use carbide drill rod or similar. You might also want to weigh down the base a bit more.

Ideas:

• make it adjustable lengthwise, as he has above
• similar to Rollomatic Concentricity Pro