Singer bobbin threader
 

I bought a Singer bobbin threader at WalMart the other day. It works by battery or electric. What a great idea! The only problem is that my machines won't sew when I use a bobbin threaded with it. Tried it on both my FWs and my 201.

Does anyone else have a bobbin threader and am I just doing something wrong when I thread the bobbins?

Do you mean a bobbin winder? I bought one and my bobbins were too large to fit on the winder. So I gave it away.

I have had one for about two years. You have to adjust the tension on it according to the size of thread that you're winding on the bobbin. To adjust the tension, turn the knob that is at the top right . Try this and see if it helps.