OMG, ***not*** the dump! There are many vintage machine collectors who love to fix up these old machines, and parts are still available for almost all of them. Many models of non-working black Singers are worth at least $30; a few collectible models are worth a lot more. Sometimes the tables are worth something as well. At the very least, post them on Craigslist or Freecycle (if you want to just give them away). On Freecycle you can specify that non-profit organizations will get first dibs.