Originally Posted by
schnurke
............My class is over ............
Even though your class is over, tell your shop what is happening and as if you can stop by for a bobbin lesson. Then sit there and do it over and over and over with them watching to check you are doing it correctly.
Another observation for you to make ... despite the unevenness of the fill of the bobbin, is the thread on there as solid as it is when the others help you? Or is it somewhat spongy?