I used to have a bare metal bolt on mine but I went to the hardware store. For 20 cents a foot you can get clear plastic tubing (I think it's 3/8" inside diameter) that will slip over the bolt and you can cut it with a razor. While cymbals don't spend much time in the transport case, they have all their weight resting on the bolt and it's not a bad idea to pad the bolt a bit.
I also went to this place locally that makes custom gaskets and they gave me like 10 discs of flexible neoprene rubber, each disc about a foot in diameter (they were going to throw them away) and a sixteenth of an inch thick. I cut holes into the center of each disc and I put the discs between the cymbals. It adds more weight and takes up more room, but the Enduro case can take it and there is no metal-on-metal contact. I have a 20 ride, 18 china, 13 hats, 17 crash, 12 spash and 8 splash in there and sometimes more.