I'm having a little trouble with this new/old machine. It is a Mercury m-380b and is basically a nakajima 380 (from what I understand). I have it sewing, but it's definitely not right yet. I understand most of how to thread it, but the tensioner on top is a bit of a mystery to me, and I haven't been able to find a manual or identical enough system. Does anyone have any insights on the correct way to run it? And might it change depending on thread size?
Lastly, I have run it several ways, not just how it is in the picture.