I went to a Featherweight maintenance class today, not Nova's, because she doesn't have one near enough, but this young woman is a certified SW technician and has three Featherweights, has worked on very many of them, and knows Nova, so nothing she said came as a surprise to me, except don't use Tri-FLow, which I've been using and will probably continue. It was enjoyable to be there with 9 other people and their Featherweights. We got as much personal attention as we needed and all machines left sewing perfectly and very shiny!!