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Yes, they should be able to get at the axle/bearings/cones to service it. But the question should be, why would you want to pay money for somebody to service one area of a part that is pretty much fucked in another area? The cost of the service will likely be more than the cost of a new hub.
Try it yourself. Cup and cone is not rocket surgery. If you fuck it up, you needed a new hub anyway.
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will LBS be able to properly service the hub with the cog in situ?
Yes, but on the other hand they are Quando and the sprocket thread is already fucked. Maybe now is the the time to consider upgrading to Novatec/Formula/KT hubs with cartridge bearings, because you may find that when your Quandos are apart the cones are pitted and new ones cost as much as hubs, or worse the cups are pitted and the hub is scrap. If you were doing it yourself, it might be worth trying to get another year out of the Quandos, but if you're paying somebody else then you're throwing good money after bad.
Have some quando fixed hubs on my beater that really need servicing, however the cog has been fixed in place with loctite as the threads on the hub were fucked save the last couple closest to spokes.
I really dont want to try and remove it as I think that would be the end of the threads accepting a cog and I remember it was a real PINTA to get it on originally due to the start of the thread being knackered.
It was a quick fix to get me rolling again that has held up really well for a couple of years but will LBS be able to properly service the hub with the cog in situ?
Sorry if this a dumb question but I'm a newb to this cup and cone malarkey...