I got a best buddy who also makes knives....and is in the textile industry. He has come across the best material I have seen for removing cocobolo, etc, from belts...he has strips of rubber material from a huge sanforizer belt used in textiles (sorry, I just know that was spelled wrong, but have not a clue as to the correct spelling) that really does the trick. It is a little heavier duty than the gum rubber, last longer. I have given him this web address, and he has registered his user name. I believe he will post to this thread soon. He has told me he would be willing to sell some of this stuff if folks are interested...worth taking a look at it, for what its worth. It really works