help with starter armature removal

[deerhunter34]

I have a 1974 20hp autoeletric chrysler outboard that I could really use some help in removing the starter armature that is mounted on top of the crankshaft I need to replace the points that is why I need to know how to remove armature with out damage if there is any kind of special tool that I would need please let me know

Thank You, Deerhunter34