Hi,
I am desperate: I cannot create the shape in the red square on the picture.
How to do it ?
It’s driving me crazy.
I use the latest Blender version 4.3.
Thanks a lot guys
I started with a shape like this:
I made it from a curve spiral and then converted to mesh and extruded a few verts to make the tail. You could also use a circle and proportional editing, probably.
Then I extruded it along the Z, and used a cylinder boolean:
Obviously I’d take more time to get the shapes more accurate for a real asset, but this is the general approach I’d take. Then just tidy up topology after applying the boolean.
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Please follow the opinion of @grant.r.brown .
Once the basic form is created, it is not difficult to edit and change the mesh. 
The Extra Objects (curves) addon hase also spirals… so you can use them as a template to build up a mesh like so:
You can start with circle, extrude it inwards:
Move some verices using proportional editing:
Extrude edge:
Tune shape:
Extrude lover edge and scale it wit Z axis to “0”:
Fill rest of the geometry:
Add bevel and subdivide:
Tune it more to have desired shape 
shape.blend (578.5 KB)
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Wow thanks a lot guys.
Andreal, I will take your blend.
That’s great, really,
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