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Old 04-21-2014, 11:09 AM
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woodwardschris woodwardschris is offline
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Join Date: Nov 2008
Location: Phoenixville PA
Posts: 42
Ballast has bigger voids than 2b. Fabric prevents migration of 2b into ballast voids.

2b has bigger voids than 1b. Fabric keeps 1b from migrating into 2b.
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