I recently purchased a Singer 128 with a vibrating shuttle, which is the first machine I've owned with this type of bobbin winder. While trying to wind the bobbin, the thread guide begins to move, but only moves so far and then it stops because the bobbin winder tire becomes tight and won't move. I loosen the screw so the bobbin winding tire will move and the same thing happens. I hope I've explained this well enough for you all to understand what the problem is. If anyone has any advice on what I can do to adjust this, please respond. Thank you.