I used prewounds before I got my bobbin winder many years ago....winding them was a nightmare for me...now it's a breeze with my Bengal winder and actually fun. I also envied all my friends that never had problems winding on their machines but it was an awful experience for me. Guess I was just one of those machine bobbin winder disasters and believe me I had lots of help and tried over and over again...it just did not ever create smooth, even bobbins so I guess you could have called me machine bobbin challenged.