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It is most likely good enough but I would try to do a little better. It seems a tiny bit stiff as a starting point though it seems to work pretty well with the spring.

I generally wipe out the inside of the holder (where the brush goes) with some scotchbright and make sure there is no corrosion lumps of bumps inside. Then I might give each side of the brush a single pass or 2 on a piece of fine sandpaper. I would do that dry because I want the leave some graphite dust for lubrication.
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