I assume your uncut because of the foreskin problem. I am as well and have yet to find any combination that works with the wench. If you find something that works let us all know.
Well I have only done 4 sets of hanging since I made mine. The only thing I can use so far is two layers of rubber rap (dishwasher gloves).
As for the rubber there are no stores I have been able to find that had this. What I did find is a rubber bungee cord, (1/4” thick by 1/2” wide) very grippy feel to it and as a plus there is a warning that produces a ruff surface on it. It works great, plus it cost less than 2 dollars Canadian and it came with 2 S hooks.