Being old, too excitable and foolish I bought a 5/8" arbor on that "E" site (don't know if it's bad protocol to use the actual name) without checking the SS id number and when I received it realized it was for a 500 (actually I 'did' check the number after I hit the purchase button - remembered the number but forgot that it was one to avoid).
I occasionally see older 5/8 arbors that say they fit the 510 but they are the older style arbor with the flange that screws on top rather than the nut/flange one the same side as the headstock.
I've read through the previous posts regarding the relative length difference, but because of the style difference, the overall length seems much less than the 7/16. One thing that I didn't see discussed was that the overall diameter of the older arbors appears larger than the newer. Cost savings by reducing material or a better design???? But I digress.
Anyway, I'm back to wondering IF I need to look for a newer arbor or trust these inaccurate and aging eyes and keep bidding on old style used ones (though I'll probably just break down and buy a new one and end all this muddled mystery)?
As before, any actual help as well as the SWAG method is greatly appreciated.
Ben