Please see the attached files. I have a cylinder and 6 bones for it. I linked bones with path and apply Volume preservation option. I want to deform the cylinder in such a way: I select the one bone and “somehow” says to blender that it have to stretch only it while keeping other bones the fixed size as they have before stretching. After such deformation my cylinder have to look something like sandglass. i.e. it have to be only one narrow region, associated with this bone, while other regions have to be the normal size.
Does anyone know how to do this ? Or maybe I need to use another tool, not Armature ??