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they require a ring nut removal tool to get at the drive side bearing - also if you dont service these semi regularly then they can be a real pain to remove, even when you do have the tool.
I bought a set of quite old 350s off here recently and the rear needed a bearing replacement, but after doing the non drive side I tried to do the drive side and couldnt get the ring nut out. However after re-assembly the hub feels way better. I think the non drive side obviously gets a lot more wear due to it being closer to the water and grime etc.
I think the free hub bearings look pretty easy to replace too - thats the next job for me
Does the DT require a proprietary tool to service?