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My SS Mark V Model 520 table saw inserts have a very slight bow, about .020 in the center when holding a straight edge end to end. However, when inserted in the table per SS instructions the vast majority of the insert ends up .016 below the table top. My original question was why (did SS build it ...

I am looking for a good reason why the SS table saw inserts for the SS 520 are set below the table top. In order to have flush inserts I have been forced to make them out of 3/8" birch plywood. Any explanation would be appreciated.