You got ahead of me. I just did this, which is exactly like yours.
The calculation is not complicated, but Moi would make it much easier.
I really don't know why it always shows the tangent point, except when there is a reference point.

So the manufacturing method i see that deals with th physics of the "wood binding" at the springs connection points is missed on these models.

The arm that extends to the connection point is not parallel with the wood pin. The helix ends "at the edge of the wood" and the arm then extends "out" in the tangent of the helix. Then, the connection point is a bend "past 90" to align with the wood slot.

This eliminates the physics of the bind. It is also a simplified manufacturing process easily automated. No "complex" bends.

Hi Booleano,

re:
> As it is difficult to explain, I am attaching a video that shows what I need to do.

Can you please also post the . 3dm model file with the objects that you show in the video?

I am not able to repeat the problem you show over here, it probably has something to do with the particular arrangement of your geometry like your reference point is not in the same plane as the circle you show.

- Michael

Hi Michael.

I apologize for my question about Tangents and the "Tangent" video that I uploaded.
I was wrong, MOI's tangent detection works perfect, it has the best snap I've seen.
I am attaching a video where my mistake is clearly seen.

Sorry Michael for wasting your time addressing this mistake of mine.

And I did not see the error because I only saw the Front view, I would have activated the 4 views I would have seen my error

Hi Booleano, no problem I'm glad you found what it was.

- Michael