Dressmaker machines were made by Dressmaker, but they also made a number of private label machines for others. There are many big manufacaturers that make machines TO SPECIFICATION for others. Janome/Kenmore, Brother, New Home, Universal, etc. Just because a machine was made in Japan does not mean it is a clone, I come across a lot of vintage machines since I rescue and repair them. Most of them have similar technology (except the Necchi made in Italy was a true odd ball but wonderful machine.) Your machine may have a little quirk that just isn't releasing the auto pop up bobbin winder. The knob on the handwheel may not be back in a tight setting. Hopefully all the great advice you are getting will solve your problem.
