Just for general knowlage, Shaft Zincs should be placed 3 to 5 times the diameter of the propeller shaft away from the cuttlas bearing. IE: A boat with a 1" Prop Shaft the bottom edge of the Shaft Zinc should be 3" - 5" away from the Strut.
The reason for this is to allow water flow to make it over the Zinc and back to the prop shaft and flow through the cuttlas (Rubber Marine Bearing) hence lubricating the bearing.
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