When I don't use prewounds I always wind bobbins using a thread stand. On all my machines the bobbins are filled evenly. I use a thread stand for all spools and cones of thread. Sometimes I use the Sidewinder and it does a better job then the bobbin winding in the picture you posted. I have a Bernina 1260 and it winds the bobbin evenly so the shop repair people are not doing their job. What is it with so many greedy non caring dealers anymore? The brand headquarters of the machines don't seem to care about the bad dealers, they never do anything about the complaints.