I have a set of early 80s Specialized hubs with sealed bearings. They look like these ones (save for having been in use for about 30 years). Three of the four spin very smoothly. The fourth seems to need replacement. The ID is 12mm and the seal reads "IKS" and "600 IRS". I have a couple questions. First, how do I remove the bearing(s) from the shell? Second, where can I find replacement sealed bearings? I found NOMA IKS 600 series bearings on the net, but the largest bore shown is 9mm. I also saw some sealed bearings at Loose Screws. Assuming I can get the bearing out to measure the OD and confirm the measurements, are those likely candidates?