Disassemble ???

I have the blender pleased now for a few weeks and am with the performance. Frozen Margaritas, so crushed ice, works fine. Aloud, he is, but for the short time of application can I live with it.
The removal of the glass container is a bit difficult, especially in the full state. Because I know better methods for cheaper devices (no longer get).
What annoys me really and actually a "no go" is, my mixer I can not take it apart. The screw with the knife is so tight that a take apart is completely impossible. In addition, also also completely smooth, so you can not grab it right to apply force.
Cleaning the gap is therefore not feasible. At the moment, no dirt has settled there, but when the time comes, I have to open the part of the dealer here. :(
Would be very grateful for tips!