A little validation checking

Validating the accuracy of the Pocket NC

This is a positional check for X and Y. Are they centered about A and B Centerline? There are 2 checks that can be made. 

1) Rotating B constantly does the center hole run TRUE as it is spun? It's really about how concentric is the platter backside bearing to the front side locator hole?

2) Once that is true rotate the indicator in the spindle 360

This is a positional check for X and Y. Are they centered about A and B Centerline?