In rec.crafts.metalworking, PCS wrote:
On Feb 26, 5:03 pm, Eli the Bearded wrote:
I've got a couple of old planetary style pencil sharpeners which tend
to chew up pencils and leave the wood all rough. I'm wondering if this
is a case of the blades needing sharpening or something else.
Sharpen a suitable piece of Cratex rubberized abrasive to a point.
Might sharpen as it sharpens?

I think this suggestion wins for ingenuity. Wonder if it would work, though.

Elijah
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and a sharpened rod of Cratex would have it's own uses