According to Bill :
Ok, my practically new (I bought it new only 32 years
ago) radial arm saw broke down. I know it is probably a
lost cause, but does any body have any idea where I
might be able to get parts for it? It is a ShopCraft
Model SC5110T1. I may have bought it from Grainger.

I think this is about as good as you can get:

http://www.owwm.com/mfgindex/detail.asp?ID=647

Betcha bought it from J. C. Penney. They may still be able to find
parts for you. Also chase down Benchmark (successor to Portable
Electric Tools which "owned" the Shopcraft brand) - which still appears
to exist in Jefferson City MO.

Benchmark is a (mostly/all handtool?) brand sold here in Canada
in some hardware stores, but no idea if it's related.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.