I haven't taken mine apart either and am not going to (yet) because it is in fine working order. But looking at Ekat the trick is in those 4 parts marked number 26. Can you acces the nut?
Nothing is visible the armature goes through the main casting (17)and there is the aluminium spinning casting on the the otherside with the freeely rotating part that the pad attatches to to give you the stroke.. ???