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Old 08-28-2012, 11:41 AM
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Join Date: Mar 2005
Location: metro NYC
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There is the small amount of magnetic steel in a solenoid, but I doubt a metal detector makes much of it. Every now and then, I encounter one of the old valve marker spikes that were installed to give a metal detector something to find. They were a square of steel welded to a spike, and painted yellow or orange.
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