A long time ago, someone put two old sewing machines out by the curb, the universal sign for free in this part of the world, both machines were too rusty to bother trying to repair, but, I salvaged all of the screws, hardware and fasteners from them,
Beautifully made screws, nuts, washers and hardware, that met my needs for repair and fabrication in my shop for many years. It was too long ago to remember what kind of machines they were, but, neither was human powered, both had fractional horsepower electric motors and associated pulleys and belts.

Best,
Ted