Found this on tinternet - some video's from Matt Pendle on how to set up your Sonic
Triming the Sonic
http://www.bekite.it/download/GKClamcleat.wmv
Stopper ball, chicken loop line lenght etc -
http://www.bekite.it/download/GKinsert.wmv
How to use the leash, re-ride etc -
http://www.bekite.it/download/GKleash.wmv
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Thats gona be helpful