From Willy: Define a standard for helper parts

[Eugen]

So you're gonna tell people the right way how to measure things? Or shall we leave it to the user how and where to place a ruler, with maximum freedom in regard of the origin and rotation center?

w.

Yes, I told that and that it as good practice to provide the HowTo guide or usage notes for the "Helpers".

But users are free to use it as they wish.

The doubled labels workaround notes I wrote above is added to make "Helpers" usable in all the cases users would they use.

Anyway, my notes are just recommendations for creators of "Helpers" parts. Feel free to use it or not.