What is the insulating material in the middle of the connecting wire?
With a transparent tape isolation, with hot melt adhesive fixed thread, with heat shrink tube insulation, a lot of ways ah.
Looked for a long time to understand your problem, I can see with a relatively thin tube into the insulation, the insulation tube into a plug in the insulation of the skin. Or for the wire, without the foreskin of the wire is not safe
The original wire is insulated paint, you often use, you can also use quick-drying insulating paint.
