Operation
Operating Instructions 581 - 01.0 - 05/201624
3. Push in the new needle into the bore of the needle thread 
through to the end stop.
Fig. 8: Inserting/changing the needle (2)
4. Align the needle (2) such that the groove is facing forwards 
and the flat part (only in needle system 579) on the needle 
piston (3) is facing to the left in the direction of the screw (1).
5. Tighten the screw (1).
(3) - Needle piston