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The top of the armature is about .5mm higher than the center point of the vice hole. Purposely done so once tension is added on to the needle bar by the needle retainer, the needle bar will actually line up perfectly in the middle of the tube. If the amature lined up perfectly with the vice hole before tension to the needle bar is added, then once it is added, the needle bar would misalign, being under the center point in the tube.
In the picture, the armature is in retraction, which is forced by the spring between the armature and the rear of the frame. Once powered, the black driver bar pushes the armature, which forces the needle pin forward. Then, the motor pulls the drive bar, which pulls the the armature, forcing it into retraction, completing the rotation cycle. At any point, if the machine is powered off, the retraction spring forces the armature into retraction so your machine doesn't stop, ending with the needle sticking out of the tube tip. Hope this answers your question.
Originally Posted by e.lollis
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