Hi, here is a link of me unwinding the armature. Have a chuckle ..
https://youtu.be/hlezVMX3kAQ
I had to make 2 simple tools for unwind and wind.
Oh not sure if you have got this far but the needle rollers are not caged so they will drop off when you take the ends off. Just put some Vaseline on the spindle and stick them back when you assemble it.
Good luck