I've been considering buying one of these. The bobbin winders on my machine/s just doesn't seem to get the thread on evenly and 9 times out of 10, I have a problem with the bobbin thread messing up...usually at athe worst possible time! I watch the winding closely to make sure it's going on smoothly but it just doesn't do the job well. Any suggestion for making certain the bobbin winder on the machine is winding correctly?