Tim and Dennis,
You are both right on the money!
My grandfather used it last. We had some big (5 foot) millstones and he'd re-cut the grooves once in a while. he had a good lot of the steel chisel parts, and we brought a few over here with us.
When dressing the quartz, he wore goggles made of fine wire mesh.
V smart folks on this forum!
Best regards,
Richard.