Fairing Block
A shim (a thin and often tapered or wedged piece of material) installed to adjust the angle of a mounted object. Often used to ensure the correct anglular installation of a transducer to the boats hull
If installing a Transducer with a wooden fairing Block, do not install a plastic transducer as when the wooden fairing Block gets wet it will swell and likely crack the Transducer. Likewise when installing a Thru Hull Transducer in a wooden Hull - do not use a plastic encassed transducer. If you must use a plastic Transducer, use a plastic fairing Block.

Bronze Thru Hull Transducer - shown with a Fairing Block behind it
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