Crampons Sharpening?

I was wondering if people sharpen crampons and when and where they would go to have it sharpened? I have my brothers old pair of crampons and they still work well, but the points are getting a little rounded and I noticed yesterday while hiking that the two front points looked at duller and rounder than other people in my group. And since we are having no snow this winter, I have been walking on bare rocks a few times and I am starting to think it would be good if the points were a little sharper.

Search and you shall find.

Crampons should be sharped using a hand file. Using a power grinder creates too much heat and will ruin the temper of the metal. This is from the Grivel instructions:

Never heat the crampon (adjustments,
sharpening, etc.), because
you'll ruin the heat treatment with
negative consequences for the
steel's strength and durability.

Sharpen the crampon's points with
a hand file and never with a bench
grinder or Dremel. Sharpen the front
and back of the lateral points, not
the sides. Front points must be
sharpened on the sides. A very
sharp point will be efficient on hard
ice though it won't last as long.

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thanks for the advice!