Hi Vrauckis,
I have attached a scene-file how I would do it. The problem in your set up is, that the “string” needs to move the “cane” but is also moved by the cane. Which is quite a dependency. This goes back and fore. There is more, that the Spline was very small spaced for the can, the “Shape” was on Automatic, etc. Let’s talk about what I think works in a stable and easy way. I think also that the way you can manage the set up is crucial.
What I suggest is more to ignore for a moment the “string” and move the “cane” directly by the twig. This can be done with a Spring and (Connector-) Hinge combination, or as I have set it up, with two Hinges (see file _02, for clarity)
In file _01 I have used only one Hinge for simplicity.
Either way, since the “string” is connected to the “twig” and the “cane”, and follows their dynamically changes, it can be produced with a Tracer and some Null objects. If you use a Spring/Hinge combination, the “string” becomes automatically a rubber band.
To have the Sweep stable, I have set up a “Rail” solution. This prevents that the Sweep flips or mis-behaves.
Keep in mind to cache all, to have less trouble with Hierarchies, etc.
I hope that works for you.
My best wishes for your project.
File _01
https://www.amazon.com/clouddrive/share/ZamXCBLZ9ecuLRd9z2XWlajkjPsaSwuSQMRxBOb5yar?ref_=cd_ph_share_link_copy
File _02
https://www.amazon.com/clouddrive/share/erAnqlgz6xCAUPNLCOBBqQL2EhVTQTbFs0W7FwIn6IO?ref_=cd_ph_share_link_copy