Prepare the Heat Shrink Tubing: Select an appropriate size of heat shrink tubing that will fit over the soldered connections and the base of the plug.

Slide Tubing Over the Wires: Before fully assembling the plug, slide the heat shrink tubing over the wires and position it near the soldered connections.

Apply Heat: Use a heat gun or the side of the soldering iron to gently heat the tubing until it shrinks tightly around the wires, providing insulation and strain relief.

Reassemble the Plug: Once the tubing has been shrunk, carefully reassemble the plug casing over the soldered connections.

Test the Connection: Plug the jack into a compatible device to ensure that all connections (audio and microphone) work as intended.