I bought the "Dritz Better Bobbin Winder" which is very similar to the Sidewinder. I sew on vintage machines, and each one winds bobbins a different way, plus I usually had to hold the bobbin, or the thread, or something to get them to wind right. I love this little tool...pretty affordable with a coupon! I don't even mind if I have to unthread the machine to use the spool of thread.