[Closed] Shimano DX Freehub

I've got this old wheel built up on a fairly retro Shimano DX hub. It's showing it's age now but a good application of grease has sorted the main bearings out.

Unfortunately the freehub is starting to struggle under samuripower(tm) and has started slipping when re-engaging after freewheeling. I should imagine it's probably just a bit dry inside.

Does anyone know where I can get a new freehub or how to take apart and service the existing one? I've googled and there's some bits on Australian and American ebay but nothing local as far as I can tell.