Do you have a least favorite aspect of this whole process we refer to as quilting? I think my least favorite is having to rewind bobbins.
Here's where the bobbins get wound on my Pfaff. At the far right, that piece with the screw in it was originally set slightly more to the left - think clockwise - but wasn't filling the bobbin very full so I took it to the dealer (shortly after purchase) and asked if that could be adjusted. He adjusted it and it now gives me full bobbins.
The bobbin sits on the peg and will be wound according to that diagram embedded in the plastic.
To start the bobbin, I have to manually wind a little bit of thread onto it, then slide the peg loaded with the bobbin to the right before running the machine to wind the bobbin. More often than not, it takes several attempts before the thread actually catches and starts filling. That is a very frustrating aspect of winding bobbins. Now someone, I'm sure, will school me on how to poke the end of the thread through that little hole in the bobbin first. Maybe I'll try that the next time I fill bobbins.
I'd like to think some bright engineer could come up (or should have by now) with a system where when you add your spool of thread, you add an identical spool of thread that runs through an area that functions like a bobbin...and ideally both would run out of thread at the same time. You'd know that when the top spool is low, that the 'bobbin' one is also low. No more filling little plastic/metal bobbins that run out on you at inconvenient times...like before you sewed those dozen or so units without thread :/
But, until that brilliant engineer develops the machine of my dreams, I'll continue to wind bobbins the 'old-fashioned way', and experience the frustrations and aggravations of so doing each time.