The earlier armature can be used with the late brush cap by using spacer washers on the armature, but they have to be small enough diameter to not short out the commutator.
I disagree with the observation that the "J" springs are harder to work with than the coils and caps; to hold the spring out of postition for brush install/removal lift them up by the end sticking out of the holder and place them to one side where there is a small V groove that will hold them while you work on the brushes. When you're done, lift them off of the V groove and let them down into the tube.
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