I use the bobbin winders on my machines. Because, as a lefty, I have trouble threading my Featherweight, each time I clean and oil it, I wind 8 to 10 bobbins. I don't want to unthread the needle to wind bobbins on the Featherweight so I wind them when I have to unthread the needle anyway. Since I use the Featherweight only for piecing, bobbins with neutral color thread work (white, cream, tan, & black).