This was requested for a project. The technique involves wrapping a sketch onto a cylinder but it also highlights a lot of techniques in sketching. I tried to add annotation to the video to help understand the process.
This is the simple version. This can be taken to the next level with a number of options to make this more universal but for the average user, this is more than sufficient to have a sustainable model. In reality, the wire would not lay on a cylindrical plane. It would traverse in many orientations and the level of effort can be exponential complicated very quickly.
Of course, there is a next level as to how to exit the wires from the chamber but that is another level. YouTube has a 10 minute limit for most of us 
Always ask yourself what the end goal is and see if this video will help you better understand a few basic techniques for making robust sketches.
Here's a bonus - "Fire Red"
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