Originally Posted by
selm
In the 'old'(55 yrs) days pincushions were filled with sand and I was told that it helped keep the needles and pins sharp.
I agree, I can't see the bird gravel doing this. I'd do some research on line for different things. I know there are a few, the ones that I have seen are very small, like sand or a tad larger, which is why it sharpens the pins going in and out.