You can disassemble them and change the bearings with two hex wrenches. Phil Wood makes the best tandem equipment around. Lastly, for my part, these hubs are a wheelbuilder's dream. They have flanges angled toward the rim, with spoke holes perpendicular to the flanges. They are forged with curvatures around the spoke holes which cradle the head of the spoke.
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About Campagnolo Components Even though Campi has succumbed to a bit of trendiness lately, they have continued to manufacture products of good quality that last. My experience as a mechanic for riders who put a lot of miles on their bicycles has shown me that Campi equipment lasts up to 4 times longer than other equipment. The best thing about Campi components is that they are of such quality that they are far easier to rebuild than a lot of other products that seem to be expendable. If you don't see the component you are looking for E-Mail or call. That is it for now.