what a pleasure to touch these to stones, hard and crisp as they are they beg for a big soft deep coticule that can be shaped to suck on them like glue, pity I don't have such a rock
thesuperiorsha...
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Here's a link to create a uniform concave surface in a granite tile with carborundum powder (you'll need two equal tiles, and the video refers to grinding glass, but process is the same)
• Amateur Telescope Making
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