You can use rolled up news paper instead of shackles and this will not take your head off like a shackle could if thing go pear shape 
 
Thread the eye of extension strap through both eyes of your tree protector, put the eye over the extension strap then pull a loop of the extension strap though the eye of the extension strap. Put a rolled up magazine or thick rolled up news paper between the eye and the loop and pull the strap back through the eye until the rolled up paper locks the lot for you. Saw this on a 4wd show- funny as but it does work.
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