Bests & Worsts Reviews from Amazon

It took me a couple of tries (I wound thread for 3 seconds and checked), but once I got the tension correct for the thread I use, it was WONDERFUL. I wound bobbins for my Singer 221 Featherweight (metal, with small holes in the sides), Singer 247 (plastic, rounded), Janome 6600 and 9400 (flat-sided plastic), and M Bobbins for my long arm. I DID have to adjust the sliding plate that holds the bobbin to allow it to load more thread. Take the time to adjust the tension and bobbins will wind perfectly. The language translation for the instructions is far from perfect for American English - but it's very good if you take the time to figure it out. One photo is of the back of the box that shows bobbin sizes. I added a conversion for 2 dimensions. I am writing this review because when I went "shopping" for a bobbin winder, most did not have enough information for me to choose. I took a chance and ordered this one. The winder that a friend has, only accepts one size bobbins with the center hole all the same size. TO THE MANUFACTURER: Adding some marks as reference for the Bobbin Holding plate would be a HUGE benefit. (I used a black marker on mine). I also added an arrow to show me which way it wound thread so that I could wrap it a few times. UPDATE: January 16, 2020. This device continues to work wonderfully for my bobbins. I have loosened the tension disc slightly to allow for more even windings. FOR THOSE WHO QUESTION if their type of bobbin will fit: So long as the inner hole of your bobbin - what you put on the shaft of this winder - is the same as any other bobbin, I do not see any reason why it would not work. I have seen videos of this SAME mechanism (without the base) as the bobbin winder of some Long Arm machines. The black "boxes" are "visual" sensors that determine when it should stop winding. You may need to adjust the position if your bobbins become over-filled or under-filled. Watch to make sure that the thread goes up and down the bobbin hub as it winds - if it doesn't, you need to adjust the tension. My Long Arm machine book gives this instruction: If the thread bunches at the bottom, reduce tension on tension disc. If thread bunces at the top, increase tension on tension disc.