check the rotor make sure the angle isnt making it stick due to looseness, check whether it is indeed an eta as i know the asian made movements (not clones) WONT wind in a winder without adjusting the angle of the actual winder box first. i have mixed feelings about the 2846 as its predecessor the 2842 was designed to be disposable after ten years of service in swatch watches, its a rough unpolished movement with apparently self lubricating plastic pallets, now im not sure if the 2846 has plastic parts as of 2006 and being of the 21 jewel variety but it IS the bottom of the eta barrel and it is discontinued. the swatch base calibre 284x came in 23 jewels in later years. my advice to you is to find a chronometer grade slow beat replacement like ive been doing and forget the 2846 all together, it may not be worth servicing and the OCTO ones come dry as a bone, especially the reversing wheel pivots, which i convert to 21 jeweled movements by swapping in jeweled bearing reversing wheels in place of its original pin pivots, works , but its a PITA and im out of spare parts now.