If I was to look for a used sewing machine for leather work AND other projects as well, what features should I be looking for? Walking foot? Heavy thread capability? Straight stitch/other stitches? Slow feed rates? Ability to remove the work surface to manipulate the work piece around a tubular base/arm (I don't know what it's called)? What brands/models to look for on the used market...Juki, Consew, Singer? I know there are dedicated Leather sewing machines you guys use but they are typically pretty expensive (for me). I'm thinking something on Craigslist or Facebook Marketplace that I might find for a bargain. So, give me a list of desirable features and a list of specific sewing machine models to keep an eye out for.