the obvious answer that comes to mind, is after it breaks. but not wanting a flying piece of wire coming through my windscreen, an observers leg, a loved ones arm, or even worse... ruining an esky that I had to sit outside the cabin to get to the recovery gear!!!

Seriously though, I got all tangled up a couple of weekends ago, dragging a mate up a pretty steep, muddy root ridden hill, and the below pics are after I got all the wire off the drum, what are your thoughts on how bad is bad is bad enough to need replacement?