I did use 5-7 USB cables all linked together that popped aprt and fell out the camera although this served a purpose and worked reasonably well when I saw the Tether Tools kit when at a workshop with Glyn Dewis I thought it was excellent.
Before Tether Tools
After Tether Tools
Tether Tools JerkStopper
Tether Tools Jerk Stopper
If you are thinking of purchasing any of these items Glyn Dewis has a code you can use to get 5% off an order on UK Light site. GLYNDEWIS5