Introduction
Before reading this guide, ensure you know how to strip wires and solder a connection. If not, please look at the following guides.
Stripping Wire: Wire Stripping
Soldering:How To Solder and Desolder Connections
Tools
Parts
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            Put one of the paired wires on one of the helping hand's clamp. Put the other pair of wires on the remaining clamp. 
 
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            Cut enough heat shrink to cover the soldered connection. 
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            Slip the heat shrink onto the connection. 
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            Using a heat generator, such as a heat gun or a hairdryer, heat the heat shrink around all of the angles until it securely covers the soldered connection. 
 
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This technique will allow wires to be extended both electrically and structurally without the need of longer wires.
One comment
Perhaps I might recommend sliding the H.S. tubing on before soldering the joint in case the wires are connected on the other end to something else.