I ran across a Singer in a round top wooden portable case with latch and key. However, it has a shuttle instead of bobbin and I don't know anything about them; how to wind, load, tension????) Anyway, I plugged it in but no one had fabric so I sewed on paper.....sounded good, but made quite a 'bird's nest'. Can anyone help me on making decision on whether to buy it? How hard it is to adjust tension? Need Help in a Hurry!!! Thanks! Oh and this will be #10!