The modern repro bobbins are about 3/32" too short for the bobbin winder on the 28/128 to fill the bobbins evenly. You will get a dog bone effect or the thread will fall off the end of the bobbin and wind onto the pin.
If you can find some vintage long bobbins, it might solve this problem, but if you can't, it's pretty easy to guide the thread on with your fingers. :)