This little script helps you create a new null at the position of your selected axis.
Just a little time-saver… sorry for the bad mouse-movement, video has been recorded on my laptop.

extra-tips (only works with one selected object):
– press cmd(on mac) / ctrl(on pc) to place the null as the next object in hierarchy
– press shift to add the null as a child of the current object
– change the orientation of your modeling axis to get a specific angle for your null

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