Sthe end part where the copper connectors are, the insulation should break apart & the copper fingers will stay stuck to the wires.
Then with a wood chisle or similar cut thru the wires right at the end of the laminations.
With the armiture you have you can then pull the looped wires out the other end.

If it was solid you'd have to burn the insulation off, or just get 'electric motors' price for it.