I have taken the wheel off and replaced them without cups or press. What you want to do is replace the linkage on the gear side if you removed it. This will retain the relationship of the axles. After removing the brush plate pull the flanged wheel on the brush plate side that covers the armature. Repair replace armature.
To re-assemble you want to position the two remaining brush plate side wheels so their drive rod attaching holes are in a horizontal line. This can be accomplished by rotating the opposite side wheels that should still be geared together. At this point your removed wheel will press back on its axle with the same orientation as the other two wheels on that side. Position it by hand and press gently with a vise. You will probably find that it seeks the correct position because of the swage marks already in the axle hub.
Take your time, your only removing/replacing one wheel.
