You can also glue the top run of tracks down to the tops of the roadwheels using superglue. Once you put the glue on the roadwheels, slide some popsicle sticks between the tracks and the upper hull to hold them in place until the glue dries. I usually leave them overnight to dry.
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
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"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell