Here's what looks to be a 500 upgraded first to a 510 (based in the loose rails in the box photo) and now a 520 at a decent price.
http://providence.craigslist.org/tls/4334328921.html
Al
500 upgraded to 510 upgraded to 520 in RI
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500 upgraded to 510 upgraded to 520 in RI
Gale's Law: The bigger the woodworking project, the less the mistakes show in any photo taken far enough away to show the entire project!