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I mounted my electric motor directly to the transom of my 22 Outrage, with a 1/8" piece of star board covering the transom, top, inside, and outside. Without the star board, the motor mount would chew up the transom gel coat and fiberglass.

BE SURE TO MEASURE CLEARANCE before mounting the star board, and use the thinnest star board you can find. My 36V Minn Kota barely slides on with the clamps at their widest setting. Makes a secure mount, though.

As WadingMark mentions, it helps to use a forstner bit to drill holes for the clamps to grip into. Keeps the unit from sliding when torque is applied in turns.