What about that 'Rescue Tape' that was talked about on the forum not that long ago Rosie? It wraps around on it self and would be like a rubber grip. You can get it Bunnings or similar stores.
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DOUGChief One Feather (Losing feathers with age)
TUG.......2014 Holden LT Colorado Twin Cab Ute with Canopy
DEN....... 2014 "Chief" Arrow CV (with some changes)
I agree with Mobi, a few layers of "dual wall" or "glue lined" heatshrink. Or some cotton reinforced rubber hose if you can find that. Hmm or even some heavy garden hose for that matter.