The Kitfox bungees came in two different sizes. It just depended on what they had in stock when the kit was shipped. 3/8 X 66" long required 6 wraps. 5/16 X 90" long required 13 wraps.
I struggled when I installed my first set and again when I replaced them. A couple years ago Dave F posted his ax handle video right about the time a friend with a model 2 was struggling trying to install some bungees.
I cut a branch off a tree and whittled a wedge on the end. It worked great. Took about 10 minutes. The key I think is the tree was a Canadian Elm.