"Woody" wrote in message
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wrote:
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Not in the case of Dewalt 718 as the base has a plastic insert and turns
as you change the miter angle so there's no chance of hitting a metal
base.

Owner manual:
http://www.dewaltservicenet.com/docu...00%20DW718.pdf

on page 9, column 3 refers to it as a "grooving stop" whose purpose is to
limit the depth of a groove. Multiple grooves stopped at the same depth
provide a dado.

~Mark.

Keith would do well to get out more and look at the tools.