I rationalized the sewing machine scene very diffierently than you guys. I initially thought; motor, lights, round bobbins that are easy to find, needles must be available, and it all has to work! So far I have gone for Singer 99, 201, Elna Supermatic a fairly early swing needle zigzagger, and a couple of others. A lucky find would be a cast iron Bernina zigzagger, model 114 or 117.