Galoots-

I recently acquired a pair of shears - two pair actually.  One was a J.
Wiss and Sons Model A pinking shears with replaceable blades.  Was
interesting to learn that pinking shears are a relatively modern tool,
first appearing in the early 20th century.  Apparently they only work well
on natural fiber fabrics so their popularity waned after the appearance of
synthetics.  The pair I got is still sharp, cutting t-shirt knit fabric
with ease (something that seems to be a problem for many scissors), with
only minor surface rust in a few spots - massive cast aluminum frame with
steel blades held by screws.  Anyhow, lots of interesting stuff at:
http://jwissandsons.com/ for those so
inclined.

The other pair were not in as good of condition.  Mechanically, the gently
curving blades meet well and the pivot is tight, but corrosion or perhaps
misuse has taken the edge off the blades so they won't cut.  I think they
are salvageable if the edge can be touched up, but I'm clueless how to
proceed.  No great loss if they are wrecked in the attempt, but I thought
someone here may be able to guide me and up the possibility that I may end
up with a useful tool. Any one with a knowledge of proper techniques,
angles, etc?

Phil