I don know whether the following approach is viable but it may be worth a try if you can locate a proper replacement carbon brush. I wonder if the brand of battery matters?
(From: rtotman@oanet.com). Why on earth would you not make new brushes yourself from the carbon rod from the center of a cheap battery. You can file or grind the graphite to just the size you need. Free too. I have done this many times with motors as small as an electric shaver to ones as large as vacuum cleaners. There is very little difference I can see in both the life of the new brushes and of the commutator segments they bear on. Electric drills are hard on brushes if you use them a lot and they get hot. I have re-brushed several drills and they are all still in service.
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