They didnt seem to be openable from outside as they didnt come when I was pulling them out, so I open them from inside... now I cant put them back together so they are correctly aligned.
I might try again but I think I will have to buy a new set
Ok ! thank you for the reply! I didn't want to use too much force and break anything so I prayed the internals ! but now I cant put back the needles at the right place there are tiny sprockets with a kind of tiny spring. Seems almost impossible. Maybe you should add that the needles can be pulled from the front after removing the glass on your guide
Its Step 2:
Use the plastic fork to gently pull of the needles.
Thats before the back cover even comes off.
Im not sure its even possible to remove the needles from the back. Most likely not without desoldering the motors that control them.
Theoretically it should be possible to remove the motors and place them back.