Originally Posted by
PaperPrincess
Wind two bobbins. Put one on the top and the other in the bobbin. The machine should use thread from top and bottom at about the same rate. You can keep an eye on the one on the top. This is only going to work if you use the same thread in the top & bobbin!
My new machine has a low thread indicator. When I had my old mechanical machine I did this once or twice and it seemed to work, but decided it was too much work and didn't continue. From some of the other posts, it sounds like your mileage (and tension) will vary, so experiment!