How do I achieve a vertical and parallel alignment of all components to each other?

The success of the correct installation is reflected in a 100% parallel and aligned alignment of the posts with each other while maintaining the required distance exactly.
Only then is it possible to quickly and easily position the gymnastics bar at the desired height.
So that you can achieve a perfect result, we will provide you with an alignment aid. This is a threaded rod with the dimensions M12 including nuts and washers.
Before setting in concrete, you mount the threaded rod together with the gymnastics rod on each of the two posts and get a perfect end result that is accurate to the millimeter. After the foundation has hardened, the threaded rod should be removed.

Structure Of Gymnastic Bar Aligned With Threaded Rod

And this is how it is used in practice:

Structure of the gymnastics bar aligned with threaded rod