Success...kind of. So if this is useful to anyone else, removing the two bolts on the motor end and the allen bolt closest to the motor allowed me to get this far. Ill try to post update if I get this thing fixed.
The motor seems to test ok. Equal resistance across the commutator and side to side and no continuity between the commutator bar and the armature stack. Also it turns freely by hand within the unit so that's a plus. Next step is trying to source some new bushes.
