Union-Fron Hugi Hub Service

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I have a set of the original Hugi hubs (circa early 90's) manufactured by Union-Frondenburg (pre DT) and the rear hub is still perfectly rideable, but in need of new cartridge bearings.

I cannot seem to find a schematic of how these hubs are put together, nor can I find any pointers to information on the hub specific toolset.

I know that the rear can be dissassembled without the toolset, but I am very hesitant to start prying, pounding and pulling on this hub without a schematic or some type of instructions in front of me.

Does anyone have any experience servicing these hubs?

And I don't believe that DT-Swiss ever sold the Union-Fron design hubs, so I don't expect that they will be able to service them, but I am checking with them currently to confirm.

tia

If you are in Australia, there is a guy in Melbourne that might have some advice....a wheel and hub guru.