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Many thanks!

It fits the description of the Norton stone, this one is 6x2x1", which is one of their dimensions. I have probably had this stone for 25 years, and it was old when I got it. It will...

Many thanks!

I have heard SiCa mentioned many times. It might be about time for me to get some. Over here I can only seem to find large quantities.

I have an old pot of coarse valve-grinding...

I found this stone in an old toolbox, and thought it might be useful either for heavy re-shaping, such as heel work, or as a lapping stone, or both.

315706

So I gave it a soak in white spirit...