A herringbone gear, a specific type of double helical gear, is a special type of gear that is a side to side (not face to face) combination of two helical gears of opposite hands.
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Posted by DELL-Lorna M on 12 May 2016 7:26. Hi Huckster516, Thank you for allowing me to address your concerns further. Consumer Tech Support is not located in the US. We are unable to provide a phone number that will connect you with a technician located in the US.