ขอมูลทั้งหมดนี้ขอขอบคุณ อาจารย์อวยชัย สุภาพจน์ Find stones that are usually one inch in diameter or smaller sized, a few larger stones might be polished in a load that is made up mainly of scaled-down stones. Fill barrel ¾ complete with stones and shake to settle. Do not use fewer, it won't operate https://beediadiamond.com/catalog/polishing-stones