Straightening Helper Blocks for 6mm Linear Rods

I got three 6mm linear rods from Amazon on separate occasions but all 3 are slightly bent. After watching several Youtube videos and have seen other manual solutions I have decided to roll my own.

With this and a pry bar under the rod, I managed to straightened all three rods to within +/- 0.001 inch with some patience:
* Print two of this out, clamp them down, insert the rod, set the dial indicator on top and a pry bar below.
* Rotate rod under dial and find the spot(s) that are the lowest