I agree with Charlie's perspective.  They don't need to be Scary Sharp, but
good enough to penetrate well.  Schwarz wrote a blog post about stripping
off zinc coating on new ones, just go keep them in better.

Mine were dull when I got them, and they worked much better after
sharpening.

On Thu, Jul 12, 2018 at 3:10 PM, Charles Driggs via OldTools <
oldtools@s...> wrote:

> I have about a dozen of them in a variety of sizes, and if used in
> hardwood they do get a little dull.  As Ed says, sharpen on the inside.  I
> have done it with a file — they are soft steel or iron, and files work just
> fine for me.  Some of them were ‘sprung’ when I found them, i.e., spread
> apart at the tips, and gently squeezing them back towards having the
> outside of the legs parallel was easily done with a vise.  These are no
> relation to precision tools, so precise methods aren’t needed.
>
>
> > On Jul 12, 2018, at 5:01 PM, Micah Salb  wrote:
>
> > Does anyone know whether pinch dogs need to be sharpened; if so, how you
> know whether they need sharpening; and how to sharpen them?
>
>

-- 
Kirk Eppler in Half Moon Bay, CA