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These knobs will out last any graph the are installed on
Mounting in the same manner as our double stack graph mount
The second graph will not telescope with the top unit
You only need this model if you plan to mount the unit where the pliers holder/support bracket will not make contact with the deck of the boat
Hummingbird except Helix 7
Stowaway These knobs will out lastThis model has a fully adjustable height from 14" to 21" to the gimble mounting location. Built with a spring loaded solid locking pin design ensures a secure lock every time. The lower tube is made of 1 8" wall aluminum seamless tubing to give superior strength to your entire setup. Built for life out of 6061 aluminum and 300 series stainless steel hardware, then Hardcoat anodized to give it additional wear and corrosion resistance. The ability to