Originally Posted by
ghostrider
Walnuts, sawdust, and any other woody type of pincushion filler will dull pins and needles faster than other stuffings. Think about a saw. It gets dull from sawing wood and is sharpened with a stone. Emery is the best filler, but even cat litter is better than walnuts as far as the life span of the pins is concerned.
I've been saying that for years but a lot of people actually believe the shells sharpen your pins. I have no idea how that is even physically possible.