Good points, I should have mentioned them. Even if you are using matched armatures and brush holders, ACG limited end-play by using thrust washers at the worm end. I believe ACG had three thicknesses used in a combination to provide some end-play but not too much. You need some clearance as the armature lengthens a little bit as it warms up in use. Don't forget that the late, barrel commutator uses a thin steel washer on the commutator end.
Also, the bronze bearing in the holder sometimes becomes loose. You can usually just push it back in, but it it's too loose, you can use a DROP of super glue to hold it in place--both holder and bearing must be clean for this to work.
One last, often overlooked part is the felt plug on the end of of the brush holder. This is used to provide an oil reservoir and to keep stuff out of the bearing. The "usual suspects" have this part, although I find them kind of pricey for what it is--I will use a piece of felt scrap and punch out the plug with a leather punch. OTOH, being a piano technician, I have a lot of different felt scraps laying about. . .
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