The grinding insert for the 24 inch Covington Rociprolap is a perforated metal disks that you place into your Rociprolap pan and is used with silicon carbide to grind down your pieces without dishing out your Rociprolap pan. You will need several small square rare earth magnets to hold the insert in the pan. These are available from many sources online. The grinding inserts keep your pan flat for longer periods of time if you do a lot of heavy grinding on your pieces in the Rociprolap.
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