chris jay wrote:whats the biggest difference
http://www.shopsmith.com/ownersite/Mast ... 8-08r2.pdf
As algae said...I'd buy the 520 in a heartbeat. It's worth double the asking price...or more. http://monterey.craigslist.org/tls/4119413578.html
Also the planer http://sacramento.craigslist.org/tls/4148961241.html is worth 2-3 times the asking price if its working.
You have some amazon deals available to you right now. I doubt you will find anything like it for awhile. I'm amazed they haven't sold already...