Yep, drops are great, not just scrap yards, find a local machine or Fab shop, ask them. I buy my stainless drops at work, but other metal is often free there. Beat up CNC vise jaws? Why no, we will not throw high quality steel away when I am there. Last week I got the worn tailstock shaft from the lathe I run, hardened polished steel, next stop jewelry anvil. I also save all car axles and springs I get near.