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Old December 4, 2012, 08:21 AM   #11
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Join Date: February 28, 2008
Location: Michigan
Posts: 2,313
The "plastic grooves" are not "plastic" but are Agate, a type of quartz.

The agate pieces are ment to move so the knife edges can aline properly.

The agate give the knife edges a place to rest that will not change over time, like a metal will (corrision,rust).
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