I have a set of FFWD F4R wheels with own-brand (presumed KT) hubs. The freehub has started binding to the extent that the rear derailleur cannot maintain chain tension when freewheeling. The freehub can still be turned by hand but it requires a moderate amount of force.

I have been unable to find a service manual or schematic online but the Reynolds website contains instructions on how to fix problems with freehub seal drag on their KT hub wheelsets along with other service documentation including a schematic.

Replacement freehub bodies for Reynolds and FFWD listed on various online stores appear identical.

Does anyone know if FFWD own-brand hubs have the same internals as Reynolds KT or have remedied a similar problem?