WOW, it really isn't that simple!
The spring arm needs to sit inside the plastic housing, so I can't push the plate over the rotor, then slip the cover over it, otherwise, the spring arms would contact the motor housing (and short out), and prevent the back cover from fitting tightly.
The only way to do it, is to complete the assembly, mount the springs, and then use small hooks to pull on the brushes: there's a gap that's about 2 mm wide left, just before the assembly can be closed. Once the brushes are slipped over the rotor, I should be able to close it right.
Now to scrounge around the house, to see what I can use...
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