Hello Dustin, I was actually thinking of using the double joint function for the elbow or knee, but you're right to inform me that the tool is used for another approach, and I thank you for that.

Thanks Dustin, I understand the theory, but in practice I have the impression that the behavior is strange and there's a bug with the rotation of the controller, it's only active by changing the values in the attributes, but surely my understanding is erroneous. Thank you very much

Did you unload lookdevkit plugin ? rrm needs floatMath node

Ah great, thank you !