Anton,
Phil Wood BBs are built the same way, with two removable cups. Most lower cost cartridge BBs have one fixed cup on the drive side and the removable one on the non drive side.
The cool thing about Phil Wood BBs is that if you want to move the BB cartridge from an English threaded to an Italian threaded BB shell, just buy new cups.
__________________
Bob
Enjoying the GA coast all year long!
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www.freewheelspa.com