Hi, I have never needed to use these washers, I don't have any. By thre sounds of it and knowing how thin these washers are, I would suggest that you will need 2 or 3 washers to get it tight enough, or make a spacer, that would be the faster/cheaper option, providing you had access to metal/lathe and drills.......regards wayne davidson invers NZ, cold and wet at the moment..........