On Mon, 10 Sep 2012 08:15:24 -0400, Stormin Mormon wrote:

Or, they have given good service, and need resharpening.

Good point. While the original Sheffield bits are about 30 years old,
they didn't 'look' dull.

Of course, they didn't work - so it's 'something'.

I don't have a grinding wheel, so I'd have to get one before I could
sharpen them (unless there is another way that doesn't use a grinder).