my video the other day showed the gc1023 and Bh handyman competing with sorex in nail above iron test ,but the point is its the concentric that wins in this test .
so today i repeat test with both concentric and DD on my trident extreme . i think this proves conclusively in certain nail situations the concentric is worth its weight in gold .
DD from both directions followed by concentric would be my reccomendation for a productive site with iron infestation..

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