Preparing to cut Plans modified from our test models list offset distances from a straight line between two points. 1/4 x 1″ flat bar tacked to the plate at a distance from the marks equal to the radius of the plasma torch cutting head. Line laid out on the steel with a punch mark at the offset distance. Cutting the steel with the plasma torch. A piece of sheet metal held on with a hose clamp extends slides along the flat bar. Bow of the hull trimmed to shape.