I have never gotten the hang of getting the starting manual winds of thread on a bobbin to "stick" the first time.
I finally got frustrated enough to think about it. The solution came fast and was dead easy to implement.
The problem is that the bobbins are slick, smooth, and slippery.
So, here's what you do:
|Score one end of the bobbin's cylinder with a knife|
|Make the cuts cross each other by changing the angle of the knife as you turn the bobbin.|
|Start your thread wrap normally with tension|
|And away you go!|