I made the one I have from a box blade and welded the blade mounts to sheets of steel that line up with punched slots in the side. This allows you to lift the blades completely above the surface you are dragging over, only allowing a "cut" on high spots.
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That 2" ball on the back is so I can drag this 3000 lb roller behind it for compaction.
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Cutting up the box blade for the plane also gave me a box I could use to drag over lose material to level with.
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I do have a hydraulic top link but I don't use it with either of those.