I should have clarified that a bit more - use rubber or rubber-coated straps to give _additional_friction_ to help keep the skeg in place. Bungee cord might not work too well - you want to get a lot of tension on the straps.

: I tried making my own version, but it wouldn't stay on the kayak. One might
: try to use some kind of rubber cord or rubber-coated cord/straps to help
: keep the skeg in place. The longer and more acute the angle of the two
: sides of the boat are, the easier it will be to keep the skeg in place.