Guys, try this simple home made tool. It is constructed from 2 lengths of aluminium channel that slide into each other (old shower screen frame). You simply rest it on 2 pieces of wood 6" high, mark the tyres on the inside where they touch. Draw a line on the channel where they channels meet. Roll the car forward until you meet the mark on the tyre (now at the rear). Set up the channels again and then check the line drawn on the channel - the gap at rear should be 1/16" wider than the front
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