Electric Bobbin Winder Automatic Bobbin Winder Machine USB/Battery Powered Bobbin Winder Portable Bobbin Winder with Handle Household Electric Winding Machine for Sewing Crafts Project

In my initial review of this winder I was critical of the ability of the machine to accept bobbins from Juki and Brother machines. It turns out the bobbins DO fit the winder shaft but they need to be pressed onto the shaft with a great deal of effort so that the top of the bobbin is parallel with the top of the driver shaft. Then the bobbins works as intended and will not fly off into neverland. In my case I still have to use a screw driver to pry the bobbin off the shaft when the winding is complete, but that works.Also, I found that the winder auto stop featue is based on an optical sensor (nice feature), and mine was set improperly so it didn't stop the winder before the thread overran the bobbin. To adjust the stop sensor I used a bobbin that had been loaded with thread to the desored fullness. Then I put it on the winder shaft and loosened the two philips screws on the U-shaped fixture containing the optical sensor adjacent to the bobbin. Move the fixture fuly away from the bobbin, press and hold the ON button and then slowly move the optical fixture slowly toward the moving bobbin until the wound thread obscures the optical path of the sensor and the drive motor automatically stops. Then tighten the two screws so the optical sensor fixture remains at the desired position for all future bobbin windings. The manual is entirely written in Chinese so this is pretty much a DIY operation, but now that I realize I need to manhandle the bobbins completly onto and off of the drive shaft, and that I can adjust the spiffy optical fill sensor, I'm satisfied with the performance of this inexpensive bobbin winder.

Simple answer to winding a bobbin for the sewing machine. Great idea!!