The message
from "DLee" contains these words:

What tools are best for sharpening spades?

Files. Sharpen the back of the spade, not the front, and don't make the
angle too sharp or it will just get blunt a lot quicker.

--
Rusty Hinge
horrid·squeak&zetnet·co·uk
http://www.users.zetnet.co.uk/hi-fi/tqt.htm