The first time I broke the Sram 3 x 7 on my Pino I had trouble getting a replacement central shaft for it. I ended up getting in touch with Sheldon, I think I even spoke to him on the phone. He had good news and bad news. Good news was he had a whole box of misc Sachs/Sram spares. Bad news was they were all unlabeled. I sent him a photo of the required part, marked up with dimensions. He had one. It wasn't listed on his website, so, as per his instructions, I had to order Part Number Special and put in the comments "Sheldon has this on his desk." It arrived at my house in the UK all the way from Massachusetts a few days later .