I'm sorry for being obtuse but are the cartridges replaceable? Do they require maintenance?

I'm asking because Shimano's Dura Ace track bottom bracket is advertised as "Sealed Cartridge" but it really isn't. It has dust seals and the bearings are in a plastic carrier "cartridge" for ease of installation but it isn't a true sealed cartridge. The fact that they print the words "Sealed Cartridge" on it don't make it any more so.

Stuff like this makes me very cynical.

So the Record Pista is maintenance free - install and forget until the bearings go bad?


-Tim-