With the a bar fully extended? Or at a stop all the way back? I usually judge my needle depth by runing the machine and seeing how far out the tube they come and adjust the tube from there. Id say i most usually hang em out full stroke about a little bit more than a nickle.So i guess i usually have it out a little over 2 mm. Is that to far? I was tought to hang the needle just out of the tube at a rest position and your throw judged your needle depth but this always scared me to tare up the skin.