Both Bruce Gordon (shifter cables only) and daVinci Designs (shifter and brake cables) offer cable splitters. I have the Bruce Gordon splitters on the shift cables and the da Vinci splitter on the rear brake of my Co-Motion S&S bike and they work very well. The shifitng remains accurate and reliable after they have been disconnected and reconnected.

They are easy to install but you need two inner wires for each installation. The only tools needed are a cable cutter and the appropriate allen key.

Contact Bruce Gordon, S&S Machine and da Vinci for purchase info. Actually, da Vinci is a one-stop shopping location for both types. Look here: http://www.davincitandems.com/comp.html

They are a one-time purchase and will last through multiple cable replacements.

Follow the installation instructions and be sure the allen clamp bolts are tight and you will have no problems. They are secure and work well.