Originally Posted by WheresWaldo
I was able to separate mine. It just takes some careful drilling on the carrier for the largest cogs. There are three pins that must be drilled out in order to separate them. When they come apart you will find that they use the same spacers as the other loose cogs, then you can build anything you want.
I think we may be talking about different things. Newer Shimano Ultegra (and Dura-Ace) cassettes mount the larger cogs onto a "spider". You may be able to separate the cogs from the spider, but they will be unusable as single cogs, because they've had the inner portion removed (presumably for some weight savings).
