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This is intended to mate the Atlas heavyweight 2 and 3 axle trucks to the old walthers heavyweight car kits. To fit these cut out a portion of the center sills, the center spine, until these can sit comfortably on the underside of the car. The center hole can then be drilled and tapped for a 2-56 screw to hold the truck on. Sanding and cutting may be necessary to secure free and smooth operation