I've got a stem that I think I'm going to have to replace, but I can't tell how big it is. When I measure it with my cheapo caliper, it's DEAD SMACK at 21.5mm, so I'm not sure if it's 21.1 or 22.2. There are markings on it, and it says Wald 3144. Google turns up an ebay auction that no longer exists with one for sale, but that's all I can find. Thanks for any help.